Justified True Belief

(●) The shipwrecked merchant from Cyprus who founded the Stoics, the school that taught the ancient world to speak of duty, providence, and a law written into nature. + Most people who use the word "stoic" today mean someone who takes bad news without flinching. The word comes from a building: a painted colonnade on the north side of the Athenian marketplace, where a tall, thin foreigner with a bent neck and weak legs walked up and down for some forty years, teaching that the whole universe is run by reason, that virtue is the only thing worth having, and that a human being is a citizen of the world before he is a citizen of any city. The people who came to listen were named after the porch. Zeno matters to Christian readers for a reason Paul discovered in person. When he preached in Athens, the Stoics were among the philosophers who argued with him (Acts 17:18), and the line of Greek poetry he quoted back to them, "For we also are His descendants," came from a poem by one of Zeno’s own students. Stoic ideas of providence, of a divine Reason (the Logos) pervading the world, of a moral law that every human being carries inside, and of duty as the shape of a good life, were in the air the gospel was first preached into. The church fathers borrowed a great deal of it, and they were clear about where they had to stop. The signature fact of his life is that every book he wrote is gone. Not one survives, not even in large fragments. We know him through a biography written some five centuries later, through Cicero, and through the Roman Stoics (Seneca, Epictetus, Marcus Aurelius) whose books did survive. The founder of one of the most durable movements in the history of thought is, on paper, almost silent.

(●) c. 334 BC: Born in Citium on Cyprus, a Greek town with a Phoenician quarter, the son of a merchant. + Zeno was born in Citium, a port on the south coast of Cyprus, to a merchant named Mnaseas (one source says Demeas). Diogenes Laertius, the third-century AD biographer who is our main source for his life, describes Citium as a Greek city partly settled by a Phoenician colony, and Zeno’s contemporaries never let him forget the Phoenician half. His own teacher would call him "my little Phoenician"; a satirist mocked him as "an aged woman of Phoenicia"; and when a fellow townsman later had his name carved on a public building as "countryman of Zeno the philosopher," Zeno told him to add "of Citium." He was not ashamed of where he came from. The same biographer gives us his appearance, and it is not flattering: tall and thin, dark-skinned, his head naturally bent to one side, with fat, flabby, weak legs that made him decline dinner invitations. He was fond of figs, fresh and sun-dried. Diogenes Laertius also passes on, from a lost work by Demetrius of Magnesia, that the merchant father, on his trips to Athens, used to bring back Socratic books for the boy, so that Zeno arrived in Athens already knowing what he was looking for. His dates are a reconstruction, and honesty requires saying so. Start with the one firm point. The decree Athens passed at his death names the archon of the year, Arrhenides. An archon was the city’s chief magistrate, chosen for a single year, and because Athens dated its years by whoever held the office, an archon’s name does the work a year on a gravestone does for us. That fixes the death in 262 or 261 BC. Everything else is counting backward from there. Persaeus, a pupil who shared his house, said Zeno came to Athens at twenty-two and died at seventy-two, and seventy-two years counted back from the decree lands the birth around 334; that arithmetic is where the "c. 334" comes from. The trouble is that the other witnesses do not cooperate. Apollonius of Tyre said he headed his school for fifty-eight years in the Greek text the Loeb edition prints (Yonge’s translation has forty-eight), a figure that fits neither the seventy-two nor the long apprenticeship that follows. Diogenes Laertius also reports that Zeno lived to ninety-eight without a day’s illness, and the shipwreck story has him arriving at thirty rather than twenty-two. Nobody can make all of these agree, and every date on his life should be read with a "c." in front of it.

(●) c. 312 BC: A shipwreck near the Piraeus left him in an Athenian bookshop, and he never went home. + The story of how a merchant became a philosopher is one of the best in ancient biography, and Diogenes Laertius tells it plainly. Zeno had bought a cargo of purple dye in Phoenicia. Purple was the most expensive commodity in the Mediterranean, squeezed a drop at a time from sea snails, worn by kings, and a shipload of it was a fortune. He was sailing it to the Piraeus, the port of Athens, when the ship went down close to shore. He walked up to the city with nothing, sat down beside a bookseller’s stall, and picked up the second book of Xenophon’s Memorabilia, a memoir of Socrates by one of the men who had known him. He was, the biographer says, about thirty years old. He liked what he read so much that he asked the bookseller where men like this could be found. As it happened, a philosopher named Crates was walking past at that moment, and the bookseller pointed and said, "Follow that man." Zeno did. He told the story against himself for the rest of his life. "I now find that I made a prosperous voyage when I was wrecked," he used to say, and by another account, "Fortune does well in having driven us on philosophy." Diogenes Laertius, to his credit, also passes on the version in which there was no shipwreck at all and Zeno simply sold his cargo in Athens and stayed. Whichever is true, the bookshop, the memoir of Socrates, and the pointed finger are the hinge of the life.

(●) c. 312–301 BC: He spent a decade or more as a student, and one of his teachers broke a pot of lentil soup over him. + Crates was a Cynic. The Cynics (the name comes from the Greek for "dog") were the followers of Diogenes of Sinope, the philosopher who lived in a storage jar, and their teaching was that virtue needs nothing: not money, not reputation, not the good opinion of the neighbors. To prove it they behaved in public in ways that made respectable Athenians cross the street. Zeno took to the philosophy and could not manage the shamelessness. So Crates handed him a clay pot of lentil porridge and told him to carry it through the Cerameicus, the potters’ quarter and one of the busiest streets in the city. When he saw Zeno trying to hide the pot under his cloak, he smashed it with his staff. The porridge ran down Zeno’s legs, Zeno ran, and Crates called after him: "Why do you run away, my little Phoenician? You have done no harm." He stayed with Crates for a while and then went looking for more. He studied with Stilpo of Megara, a philosopher famous for arguing that the wise man is self-sufficient; when Crates tried to drag him back by the cloak, Zeno said the way to hold a philosopher was by the ears. He studied logic with Diodorus Cronus, and paid a lecturer double his asking price to learn seven forms of a single argument. He sat for years under Polemo, the head of Plato’s Academy, who accused him, with some justice, of slipping in by the garden gate to steal Academic doctrines and dress them "in a Phoenician dress." One source says the whole apprenticeship lasted twenty years. What came out of it was a philosophy stitched from all of them: the Cynics’ conviction that virtue is enough, Stilpo’s self-sufficient sage, the logicians’ rigor, and from the Academy a serious interest in how the world is put together. Zeno was never original in the way Plato was. He was original in the way a good builder is, and the building stood for five hundred years.

(●) c. 301 BC: He began teaching in a painted public colonnade, and his students were named after the building. + Plato had taught in a private grove; Epicurus, Zeno’s contemporary, taught inside a walled garden. Zeno chose a public porch. The Stoa Poikile, the "Painted Colonnade," stood on the north edge of the Agora, the marketplace and civic center of Athens, and took its name from the great panel paintings hung along its back wall, among them the battle of Marathon. Anyone could walk through it, and anyone did. Diogenes Laertius says Zeno walked up and down there delivering his discourses, and adds a detail worth pausing over: he chose the spot wanting to make it tranquil again, because under the Thirty (the junta that ruled Athens for a murderous year after its defeat by Sparta in 404 BC) some fourteen hundred citizens had been put to death there. A place of judicial murder became a place of philosophy. His pupils were at first called Zenonians. Then, from the stoa, they were called Stoics, and the name stuck to the school for the rest of antiquity and to the English language ever since. There is something fitting in it: a philosophy that told people to accept whatever fortune sent was named not after its founder but after the porch he happened to stand in. The school kept no fees and no walls, though Zeno, who disliked crowds, would sometimes charge admission to thin them out and always sat at the end of a bench so that no one could sit on both sides of him. He walked with two or three companions at most. Comic poets made fun of his austerity, and the fun preserved it: "This man adopts a new philosophy," wrote Philemon; "He teaches to be hungry; nevertheless, He gets disciples." Athens turned it into a proverb, "more temperate than Zeno the philosopher."

(●) c. 276 BC: A king of Macedon asked him to come to court, and he sent two students in his place. + Antigonus Gonatas, king of Macedon and the most powerful man in Greece, attended Zeno’s lectures whenever he was in Athens and kept inviting him north to Pella, where his court sat. Diogenes Laertius preserves an exchange of letters: the king asking for a teacher who would, through him, instruct all the Macedonians, and Zeno answering that he was eighty years old and would send men who were his equals in learning and his betters in health. The letters are generally judged a later composition, as most philosophers’ correspondence in ancient collections is, and the "eighty" fits only the tradition that he lived to ninety-eight; on Persaeus’s count of seventy-two years, Zeno never reached eighty at all. But the invitation itself, and Zeno’s reply to it, are well attested: he stayed on his porch and sent Persaeus of Citium and Philonides of Thebes. The king took the refusal well. He dined with Zeno, carried him off to dine with a harp-player, and once, asked why he admired him, answered: "Because, though I gave him a great many important presents, he was never elated, and never humbled." That was the teaching demonstrated. Zeno lived on small loaves, honey, and a little fragrant wine, wore a thin cloak in winter, and, as a favorite line of his put it, believed it was better to trip with the feet than with the tongue. A young man who talked too much was told, "This is the reason why we have two ears and only one mouth, that we may hear more and speak less." Asked what a friend was, he said, "Another I." Ambassadors from Ptolemy of Egypt once sat through a dinner at which Zeno said nothing at all, and asked him what they should report to their king. Tell him, said Zeno, that there was a man in the room who knew how to hold his tongue.

(●) c. 262 BC: He died an old man, and Athens buried a foreigner at the public expense. + Diogenes Laertius gives the death the way ancient biography liked to give a philosopher’s death, as a scene. Leaving the school one day, Zeno tripped and broke a toe. He struck the ground with his hand, quoted a line from a lost poem, the Niobe, "I come: why call me so?", and then, the biographer says, stopped his own breath and died on the spot. He offers two other versions in the same breath, that Zeno died of old age and that he starved himself, and none of them can be checked. What the story is meant to show is a man who took a stumble as a summons and went without complaint. The Stoics did hold that a wise man may leave life when the time is right, a view the church would later reject at full strength. What can be checked is what Athens did next, because Diogenes Laertius copied out the decree. On the motion of one Thraso of Anacaea, the assembly resolved that since Zeno had spent many years in the city in the study of philosophy, "making his own life a model to all men of the greatest excellence, since it has in every respect corresponded to the doctrines which he has taught," the people would praise him, crown him with a golden crown "on account of his virtue and temperance," and build him a tomb at public expense in the Cerameicus, the city’s cemetery of honor, in the same district where Crates had once smashed the porridge pot over him. The decree was to be cut on two stone pillars, one set up in Plato’s Academy and one in Aristotle’s Lyceum, "that every one may understand that the whole people of Athens honours good men both while they are living and after they are dead." He had never been a citizen. He was a resident alien, a Phoenician from Cyprus with an accent, and the city that had executed Socrates buried him beside its war dead. When the news reached Macedon, Antigonus said, "What an audience I have lost." Cleanthes of Assos, a former boxer who had worked nights carrying water to pay for his days at the porch, succeeded him as head of the school.

What He Taught

(T1) The goal of a human life is to live in agreement with nature. + Watch a newborn anything, a foal, a kitten, a baby. Before it has learned a single thing it already reaches for warmth and food and pulls away from what hurts. Zeno began his ethics there. The first impulse of every living creature, he taught, is toward its own preservation and its own constitution; nature "endears" each animal to itself, in the Stoic phrase, before it can be taught to want anything. The Greek word is oikeiōsis, from the word for a household: a creature is at home with itself from the first breath, and that homing instinct, not pleasure, is the ground floor of all motivation. A human being has something added to the ground floor. We have reason, and reason, once it grows up, takes over the job the instincts were doing. So for a person, living according to nature means living according to reason, and living according to reason turns out to be the same thing as living according to virtue. Zeno was, by the biographer’s account, the first to state the goal of life this way, in a lost book called On the Nature of Man. It is the sentence every later Stoic adjusted and none abandoned. Notice what "nature" means here, because the word is doing double duty. It means your own nature, the constitution you were born with. It also means the nature of the whole, the rational order that runs the universe (T3). The Stoic claim is that these fit: a person using reason well is in tune with the Reason that governs everything. Christian readers will hear an echo of Paul’s Gentiles who "by nature do what the law requires" (Romans 2:14), and also a warning: "nature" for Zeno is not "whatever comes naturally." Most of what comes naturally to a grown man, he thought, was corrupted judgment (T4).

(Q) "Zeno was the first writer who, in his treatise on the Nature of Man, said, that the chief good was confessedly to live according to nature; which is to live according to virtue, for nature leads us to this point." + Source: Diogenes Laertius, Lives of Eminent Philosophers VII.87 (Yonge translation). Zeno’s own books are lost, so his teaching survives in the reports of others, and this is the report that fixed the Stoic definition of the goal of life (T1). Diogenes Laertius adds that Cleanthes, Posidonius, and Hecaton, later heads and teachers of the school, all said the same.

(T2) Virtue is the only good, and health, money, and reputation are neither good nor bad. + You might think, "Then Zeno is saying it does not matter whether I am sick or well, rich or ruined." He is not, and the distinction he drew to avoid saying it is one of the most useful tools in ancient ethics. Good, in the strict sense, is whatever benefits you no matter how it is used; and only virtue passes that test, because health and money can be used for evil and often are. Everything else, life and death, health and sickness, wealth and poverty, fame and disgrace, falls into a class the Stoics called the indifferents. Yet within that class some things are "preferred" and some "rejected." A sane person chooses health over sickness, and should. What he must not do is believe that the health makes him good, or that its loss makes him bad. A chess analogy helps. A player prefers to keep her rook, and it would be foolish not to. But the excellence of the game is in the quality of the play, and a lost rook can be played brilliantly. Zeno held that the excellence of a life is in the playing, and Cicero, who found the doctrine hard to swallow, reports Zeno’s answer to every complaint about pain: "nothing is an evil but what is base and vicious" (Tusculan Disputations II.29). Diogenes Laertius records the school’s reasoning, and it runs in three steps. Heat warms and never chills; in the same way, whatever is truly good benefits and never harms. But wealth and health can harm, and often do. So wealth and health, whatever else they are, are not goods. The doctrine was tested on one of his own students. Antigonus, wanting to try Persaeus, had false news brought to him that his estate had been ravaged by the enemy, and watched Persaeus’s face fall. "You see," said the king, "that wealth is not a matter of indifference." The Stoics never pretended the doctrine was easy to live; they said only that the sage lived it, and were honest enough to admit they could not point to one.

(Q) "Again, they affirm that it is of itself sufficient for happiness, as Zeno says, and he is followed in this assertion by Chrysippus in the first book of his treatise on Virtues, and by Hecaton in the second book of his treatise on Goods." + Source: Diogenes Laertius, Lives of Eminent Philosophers VII.127 (Yonge translation). The "it" is virtue. Diogenes is reporting the Stoic doctrine that virtue by itself is enough for happiness, and naming Zeno as the one who first asserted it (T2). Chrysippus was the third head of the school and its great systematizer; Hecaton of Rhodes a Stoic writing around 100 BC.

(T3) The world is a living, rational whole, and the reason that runs it is God. + Suppose you found flutes growing on an olive tree, tuned and ready to play. You would not conclude that the tree got lucky. You would conclude that whatever made the tree knew something about music. That is Zeno’s argument, as Cicero reports it, and the thing growing on the tree is us: the world produces living, reasoning beings, and nothing gives what it does not have, so the world is not itself dead and mindless. It lives, it reasons, and the reason in it is what Zeno was willing to call God. The physics behind this is simple to state. (Physics, for a Greek philosopher, was not a matter of equations; it was the account of what the world is made of and what runs it.) There are two principles in everything, he taught in a lost book called On Substance: matter, which is passive and has no qualities of its own, and reason (the logos), which is active and works on the matter from inside. That active reason is God, who, "being eternal, and existing throughout all matter, makes everything." Zeno pictured it as a fire, but a fire that builds rather than burns: nature, in the definition Cicero preserves (On the Nature of the Gods II.57), is "an artificial fire, proceeding in a regular way to generation," a craftsman’s flame that grows olive trees and eyes and stars by method. Because that reason is everywhere, nothing happens by accident. The Stoic name for this is providence, from the Latin for "foreseeing," and the Stoic word for its iron side is fate. A slave Zeno was beating for theft protested that he had been fated to steal. "Yes," said Zeno, "and to be beaten." This is the doctrine the church fathers found most useful and most dangerous at once. Useful, because here was a pagan school arguing from the order of the world to a governing Mind, and calling that Mind Logos, the very word John’s Gospel opens with. Dangerous, because Zeno’s God is not outside the world making it; he is inside the world as its soul, and the world is, in Diogenes Laertius’ blunt summary of Zeno, "the substance of God." A God who is the universe cannot create it from nothing, cannot stand over it in judgment, and cannot, in any ordinary sense, love it. The church fathers would spend centuries walking the line between those two ideas, taking the governing Mind and refusing the God who is the world.

(Q) "Nothing that is destitute itself of life and reason can generate a being possessed of life and reason; but the world does generate beings possessed of life and reason; the world, therefore, is not itself destitute of life and reason." + Source: Cicero, On the Nature of the Gods II.22 (Yonge translation; Book II, chapter VIII in Yonge’s own chapter numbering). Cicero puts Zeno’s argument in the mouth of Balbus, the Stoic spokesman of his dialogue, who quotes it as Zeno "briefly laid down" it, then follows it with the olive tree and the flutes (T3). Cicero’s skeptic Cotta answers in Book III (III.23) that by the same logic the world must also play the flute, since it produces flute-players; the exchange is the ancient design argument and its ancient objection in a single dialogue.

(T4) The passions are not feelings to be managed but false judgments to be corrected. + A man loses his job and cannot sleep for dread. Ask him why and he will say, "Because losing the job is terrible." Zeno would say the dread is not something that happened to him; it is something he is doing, and the thing he is doing is believing a falsehood. A passion, in his definition (the Greek word is pathos, the root of "pathetic" and "sympathy"), is a movement of the soul against reason and against nature: an impulse that has slipped its leash. And behind every such impulse is a judgment, a verdict that some indifferent thing (T2) is really good or really evil. Grief judges a present thing evil; fear judges a future thing evil; desire judges a future thing good; pleasure, in the Stoic sense of giddy elation, judges a present thing good. Those are Zeno’s four kinds, and every disorder of the heart, he taught, is one of them. The man who cannot sleep is a case of the second: his dread is a verdict that something still in the future is an evil. It follows that the cure for a passion is not to suppress it but to stop believing what it believes. Change the verdict and the storm goes out of the feeling. This is why the Stoic ideal was apatheia, freedom from passion, which does not mean feeling nothing (the sage still has "good feelings": joy, caution, rational wishing) but means having no feelings founded on error. It is also why Stoicism has always looked, from outside, like a school for not caring, and why modern cognitive therapy, which treats anxiety by examining the beliefs underneath it, openly claims Zeno’s school as an ancestor. Christian moral teaching took over a great deal of this and refused one piece. That the heart follows the mind’s verdicts, that wrong desires rest on wrong beliefs about what is worth having, that a well-ordered soul is one whose loves are rightly ranked: Augustine could sign every word. What he would not sign is the ideal of a heart untroubled. Jesus wept at a friend’s grave (John 11:35). In the Christian picture some griefs are true verdicts about a broken world, and the sage who feels none of them has not seen the world rightly.

(Q) "A perturbation is a commotion of the mind repugnant to reason, and against nature." + Source: Cicero, Tusculan Disputations IV.11 (Yonge translation; Book IV, chapter VI in Yonge’s own chapter numbering). Cicero introduces this as "Zeno’s definition," noting that what he translates "perturbation" the Greeks call pathos (T4). Diogenes Laertius gives the same definition in nearly the same words (Lives VII.110), citing Zeno’s lost book On the Passions for the four kinds.

(T5) All rational beings belong to one city, and the walls between cities are a mistake. + The first book Zeno wrote, while still a student of the Cynics, was a Republic, and his critics said he had written it "on the tail of the dog," a jab at the Cynics, whose very name means dog. Plato’s Republic had designed a perfect city with guardians, classes, and laws. Zeno’s answered that there should be no cities at all in the old sense. Because every human being shares in the same reason (T3), all of us are already fellow citizens of a single commonwealth, the cosmos, governed by a single law, the law of reason. Plutarch, four centuries later, summarized the book’s aim: that we should not live in separate cities under separate codes but regard all people as fellow countrymen, one way of life and one order, like a flock feeding together in one pasture. The details, as reported, were meant to shock. No temples, because a god does not live in a building. No law courts, no gymnasia, no coinage. Men and women in the same dress. The only true citizens, friends, and free people are the virtuous; everyone else is a stranger, an enemy, or a slave to his own errors. Later Stoics were embarrassed by parts of it, and one librarian at Pergamum was caught cutting the offending passages out of the school’s copies, which had to be put back. But the core idea, that a person is a citizen of the world before he is a citizen of any city, outlived the details and became one of the most consequential ideas in the history of ethics. The word for it, cosmopolitan, "citizen of the cosmos," had been coined by Diogenes the Cynic; Zeno’s school turned a Cynic’s quip into a doctrine. Christian readers will feel both a kinship and a difference. Paul told a mixed congregation that "there is neither Jew nor Greek, there is neither slave nor free, there is no male and female, for you are all one in Christ Jesus" (Galatians 3:28), and told the Athenians that God "does not live in temples made by man" (Acts 17:24). But the ground of Paul’s one community is not a shared reason; it is a shared redemption, and the door is not restricted to the wise. Zeno’s commonwealth admits only sages. The church was built for the rest of us.

(Q) "The so much admired commonwealth of Zeno, first author of the Stoic sect, aims singly at this, that neither in cities nor in towns we should live under laws distinct one from another, but that we should look upon all men in general to be our fellow-countrymen and citizens, observing one manner of living and one kind of order, like a flock feeding together with equal right in one common pasture." + Source: Plutarch, On the Fortune or Virtue of Alexander I.6, 329a–b (Goodwin translation). Plutarch is arguing that Alexander the Great, by mixing Greeks and Persians, achieved in practice what Zeno only dreamed on paper; the summary of the Republic is his (T5). Since Zeno’s book is lost, this and the hostile report in Diogenes Laertius (VII.32–34) are the main evidence for what it said.

(Q) "Zeno thinks the law of nature to be the divinity, and that it has the power to force us to what is right, and to restrain us from what is wrong." + Source: Cicero, On the Nature of the Gods I.36 (Yonge translation; Book I, chapter XIV in Yonge’s own chapter numbering). The speaker is Velleius, who speaks for the rival school of Epicurus in Cicero’s dialogue and is running through the philosophers’ opinions about God in order to find fault with each of them; Cotta the skeptic does not take the floor until later in the book. So the line comes from an opponent, not a disciple. Velleius goes on to complain that he cannot see how a law can be alive, and that a God identical with the sky is "deaf to our prayers." The one line, all the same, is the seed of the Western idea of natural law: a moral law built into the world, binding on everyone, before any king or parliament wrote anything down. That idea is where the church would meet Zeno most gladly, and Velleius’s complaint is where it would part from him.

What Christian Thinkers Made of Him

(†) Paul argued with Stoics in Athens, and the poet he quoted back to them had been Zeno’s student. + Three centuries after Zeno died, a Jewish tentmaker stood in the same Agora and got into arguments. "Some of the Epicurean and Stoic philosophers as well were conversing with him," Luke records, and some of them called him a "scavenger of tidbits," a picker-up of scraps of other men’s learning (Acts 17:18). They brought him to the Areopagus, the rocky rise above the marketplace, to explain himself, and what he said there is the most Stoic-sounding speech in the New Testament. God made the world and everything in it; he does not live in temples made by hands (Zeno had said so, T5); he is not far from any one of us; "in Him we live and move and exist." Then Paul quoted a Greek poet to the Greeks: "as even some of your own poets have said, For we are indeed his offspring" (Acts 17:28). The poet was Aratus of Soli, and the line is the fifth of his Phaenomena, a poem on the stars that was, by some accounts, the most widely read Greek poem after Homer. Aratus, according to the ancient lives of him, had studied in Athens under Zeno. So Paul, arguing with Stoics, reached for a Stoic poem written by Zeno’s own pupil, and used its account of a Zeus in whom all things live as a bridge to the God of Israel. The bridge held right up to the resurrection of the dead, at which point some of his hearers sneered (Acts 17:32). Paul’s letters carry the same fingerprints. His Gentiles who, without the Law, are "a law to themselves," showing "the work of the law is written on their hearts, while their conscience also bears witness" (Romans 2:14–15), are recognizably people living by the natural law Zeno had called divine. The point is not that Paul was a Stoic. It is that the Stoics had cleared ground the gospel could be preached on: one God, one moral law for all nations, one human family. Zeno built the porch; Paul walked into it with news the porch had not heard.

(†) The church fathers judged the Stoics right about how to live and wrong about God. + Justin Martyr, the second-century philosopher who kept his philosopher’s cloak after his baptism, gave the verdict the church would mostly stick to. Of the Stoics he wrote that, "so far as their moral teaching went, they were admirable," and he explained why in a phrase that became the standard Christian account of pagan wisdom: it was "on account of the seed of reason implanted in every race of men." The Logos who became flesh in Christ had sown seeds of himself among the nations, and Zeno’s school had grown one. "Whatever things were rightly said among all men," Justin concluded, "are the property of us Christians." Clement of Alexandria and Origen used the Stoics the same way, as a quarry of good ethics, and Tertullian, no friend of philosophers, could still call Seneca, the Roman Stoic, "often one of ours" (On the Soul 20, Seneca saepe noster). They took a great deal. For one thing, the idea that every person carries a moral law within (T1). For another, the four cardinal virtues, the "hinge" virtues on which the rest of a good character turns, older than Zeno but defined afresh by him, which Ambrose lifted into Christian teaching. Then there is the analysis of the passions as disordered loves (T4), which Augustine reworked into the claim that the whole moral life is a matter of what you love and in what order. And there is the picture of the Logos as the reason running through creation (T3), which Christians had already met in John’s Gospel and in Philo of Alexandria. When Christians spoke of providence, of conscience, of duty, of the brotherhood of all people under one Father, they were often using words the Stoics had worn smooth first. What they would not take was Zeno’s God. Justin’s praise of Stoic ethics comes on the heels of a complaint that the Stoics bound everything to fate, and that a God caught up in fate is nothing but the world itself, forever turning, dissolving, and coming round again; that is the fault line every father saw. A fire that pervades the universe is not the Maker of heaven and earth. The church used Zeno’s ethics with gratitude and left his physics on the porch.

(†) The Christian word "duty" came down a line that starts with a book Zeno wrote. + Here is a small and traceable example of how a lost book can shape a civilization. Diogenes Laertius says Zeno "was the first who ever employed the word duty" in its philosophical sense, and wrote a treatise on it. The Greek word is kathēkon, "what is fitting," the action that suits a creature’s nature and station: a father providing, a citizen serving, a friend keeping faith. Zeno’s book is gone. But a later head of the school, Panaetius, wrote his own On What Is Fitting, and Cicero, in the last year of his life, turned it into Latin as De Officiis, "On Duties," choosing the word officium to carry the Greek. Four centuries after Cicero, Ambrose, the bishop of Milan who baptized Augustine, sat down to write a handbook of ethics for his clergy. He took Cicero’s three books as his frame, kept the title, and filled the frame with Scripture: De Officiis, the duties of Christian ministers. Through Ambrose the Stoic scheme of duties passed into the moral theology of the Middle Ages, and through the Latin word into English, where "duty" and "office" still carry it. Every time a Christian speaks of "the duties of a Christian," a line of descent runs back through Milan and Rome to a Phoenician on a porch in Athens, coining a word. The church did not merely borrow the word; it changed what stood behind it. For Zeno, duty was what fitted a rational creature in a rational cosmos. For Ambrose, it was what fitted a creature made in God’s image and answerable to him. The shape of the obligation was Stoic. The Person it was owed to was not.

(†) Where the gospel parts company with him: God is not the world, the soul is not a breath that burns up, and grace is not self-help. + Honesty requires the other column of the ledger, and it is a long one, because Stoicism is the pagan philosophy most easily mistaken for Christianity by people who have not looked closely at either. - God. Zeno’s God is the world’s own reason, a fire inside matter (T3). Scripture’s God made the world and stands outside it: "The God who made the world and everything in it, being Lord of heaven and earth, does not live in temples made by man" (Acts 17:24). A God who is the universe cannot create it, cannot judge it, and cannot forgive it. Velleius’s complaint that Zeno’s divinity is "deaf to our prayers" is one the church repeated. - History. Zeno taught, in his book On the Universe, that the world is periodically destroyed by fire and made again, and Tatian, a second-century Christian apologist, reports in his Address to the Greeks (chapter 3) that Zeno taught the same lives come round with it, the same men rising to do the same deeds, round after round. Scripture’s history runs once, from creation to judgment, and ends not in a fire that resets but in a new heaven and a new earth. - The soul. For Zeno the soul is a warm breath, a body, which survives death for a while and then perishes; only the soul of the universe is immortal. The gospel promises the resurrection of the body and a life that does not end, which is exactly the claim that made the Athenians sneer (Acts 17:32). - Fate and prayer. If everything is fated, prayer is theater; the slave who was going to be beaten anyway (T3) had no one to appeal to. Christians took over the Stoic word "providence" and emptied the fatalism out of it: a Father who foresees is a Father who can be asked. - The passions. The Stoic sage feels no grief; Jesus wept (John 11:35), and Paul told the Romans to weep with those who weep (Romans 12:15). In the Christian picture, some sorrow is not a false judgment but the right response to a world that is genuinely wrong (T4). - Suicide. The Stoics permitted the wise man a "rational departure" from life, and the story of Zeno’s death (the broken toe, the held breath) is told as one. The church forbade it from the beginning, on the ground that a life is not the owner’s to end. - Grace. The deepest difference. Zeno’s sage becomes good by correcting his own judgments, by his own effort, and the school admitted it could name no one who had managed it. The gospel begins from that admission and answers it from outside: "For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast" (Ephesians 2:8–9). Zeno’s commonwealth is a city of sages who earned their way in (T5). The church is a city of forgiven people who did not. None of this makes the porch worthless. It makes it a porch: a public place, open on one side, where a great deal of true moral reasoning was done, and which was never a house to live in. Paul stood in it and pointed past it. The church has been doing the same ever since.