Chrysippus: Philosophy, Quotes & Legacy

Biography

Chrysippus was born around 280 BCE, probably at Soli in Cilicia, in what is now southern Turkey. He came to Athens as a young man and studied at the Academy under Arcesilaus, the founder of Academic Scepticism, before attaching himself to the Stoic school of Cleanthes. The tradition records that he was a brilliant and tireless student — he is said to have written five hundred lines a day — and that his intellectual range was so wide that he was called the "second founder" of the school. When Cleanthes died around 230 BCE, Chrysippus succeeded him as head of the Stoic school, a position he held until his death around 207 BCE.

Chrysippus was the most prolific philosopher of antiquity. The ancient catalogues attribute over 700 works to him — the count varies from 705 to 875 — and his writing covered every part of the system: logic, physics, ethics, theology, and the theory of knowledge. None of these works survives intact; they were lost in the general destruction of the ancient world, and we know Chrysippus mainly through the extensive quotations preserved by later authors, above all by the physician Galen, who quotes him at length in order to refute him, and by the doxographers. The anecdote about his death, reported by Diogenes Laertius, is famous: he is said to have died of laughter at a joke he made about a donkey eating figs and drinking wine unmixed — "now give the ass a drink of wine to wash down the figs." Whether the story is true or not, it captures the character of the man the tradition remembers: formidable in argument, prolific in writing, and given to dry and sometimes absurd humor.

Historical Context

Chrysippus inherited the school at a moment of crisis. The Stoic system as Zeno had founded it was complete in its outlines but not in its detail, and it was under attack on all fronts: from the Academy, where Arcesilaus had revived the scepticism of the early Academy and argued that knowledge is impossible; from the Epicureans, who denied providence, fate, and the rationality of the universe; and from within the school itself, where the doctrines of Zeno were being interpreted in divergent ways. Chrysippus's task was to defend the system against all these attacks and to give it the technical form that would make it unassailable.

He did so with extraordinary success. Against the Academic sceptics he developed the Stoic theory of knowledge — the theory of the "cognitive impression," the presentation so clear and self-evident that it cannot be false — and the Stoic logic of propositions, which was the first systematic logic of statements and which the tradition rightly credits to him. Against the Epicureans he defended the doctrine of providence and fate. And within the school he fixed the doctrines so completely that his formulation of the system became canonical: "If Chrysippus had not existed," ran the saying, "the Stoa would not have existed."

Core Ideas

The Logic of Propositions

Chrysippus's greatest technical achievement is the logic of propositions. Where Aristotle's logic analyzed the relations of terms within a proposition — the syllogism — Chrysippus developed a logic of whole propositions and their combinations: conjunction, disjunction, negation, and the conditional. The Stoic logic was the first to recognize the conditional as a basic logical form, and the Stoic account of valid argument — the five "indemonstrables" from which all others are derived — was the most advanced logic of antiquity until the nineteenth century. Modern commentators, from the Stoic scholarship of the twentieth century onward, have recognized the Stoic logic as a genuine anticipation of the propositional logic that Gottlob Frege and Bertrand Russell developed two thousand years later.

The Defense of Fate and Freedom

Chrysippus's most famous philosophical work is the defense of fate against its critics, and the reconciliation of fate with human freedom. The problem is as old as the doctrine itself: if everything happens by necessity, how can human action be free and moral responsibility possible? Chrysippus's answer, which has shaped the entire history of the problem, is a form of compatibilism. The distinction he draws is between simple necessity and conditional necessity: it is fated that I do what I do, but it is not fated that I do it whether I choose to or not — my choice is itself part of the fated chain. The famous example is the "cylinder and cone" of Chrysippus: push a cylinder and it rolls, push a cone and it spins; the push is the same, but the outcome differs because the natures differ. In the same way, the same impressions affect different people differently, because their assent differs — and this difference is the ground of responsibility. Fate determines the occasion, but the character's response is its own, and for that response the agent is responsible.

The Unity of Virtue

In ethics, Chrysippus systematized the doctrine that virtue is one: the virtues are not separate dispositions but one and the same disposition of reason, viewed under different aspects. The wise man possesses all the virtues, because the virtues are the same knowledge — knowledge of what is good, what is evil, and what is indifferent — viewed in its application to different domains. Chrysippus also developed the doctrine of the "appropriateness" (oikeiosis) of living things toward themselves, the theory that grounds the Stoic account of the natural foundation of ethics: every living thing is, from the first moment, disposed to preserve itself, and ethics is the development of this primordial self-affection into rational self-command and then into concern for others.

Philosophy

Chrysippus is the systematizer of Stoicism in the strict sense: he did not invent the doctrines — they are Zeno's — but he gave them the technical form in which they could be defended, taught, and transmitted. His contribution has two aspects. The first is defensive: he met the attacks of the Academy and the Garden and turned them back, establishing the Stoic theory of knowledge and the Stoic logic as serious rivals to every other system of the age. The second is constructive: he organized the Stoic system into its canonical tripartite structure — physics, logic, ethics — and he fixed the doctrines of each part so completely that the later Stoics, even the great Roman ones, regarded his formulation as authoritative.

His doctrine of fate is the philosophical heart of the system, because it defines the Stoic conception of freedom. For Chrysippus, fate is not the negation of freedom but its condition: the wise man is free not because he escapes the causal order but because he understands it and wills it. The formula of the Hymn — "the fated may lead the willing, and drag the unwilling" — is the same doctrine in Cleanthes's religious idiom; Chrysippus gave it the technical form that made it the ancestor of every subsequent compatibilism, from the Stoics through the scholastics to the modern debate on free will.

Major Works

Chrysippus's corpus is the largest in antiquity — over 700 works according to the catalogues — and it covered every part of the system. The most famous titles include the On the Soul, the On the Gods, the On Fate, the On the Passions, the Logical Investigations, and the On the Chief Good. All are lost; the reconstruction of his doctrine rests on the quotations of later authors, above all Galen's On the Doctrines of Hippocrates and Plato, which preserves long extracts of the On the Passions, and the doxographical compilations of Stobaeus and Diogenes Laertius. The modern edition of the Stoic fragments by Hans von Arnim collects what survives.

Famous Quotes

The most famous saying associated with Chrysippus is the verdict of the tradition on his role in the school: "If Chrysippus had not existed, the Stoa would not have existed." His formulation of the goal of life, reported by Diogenes Laertius, states the doctrine of living in agreement with nature. And his account of the passions — that they are judgments, errors of reason in which we mistake indifferents for goods and evils — is reported by Galen in the form in which the later Stoics transmitted it.

Related Thinkers

Chrysippus was the pupil and successor of Cleanthes, whose fidelity to Zeno of Citium's doctrine he transformed into a complete system. The Roman Stoics regarded him as the authority on the school's doctrine: Seneca cites him constantly, and Epictetus transmits his doctrines as the canonical statements of Stoicism. His doctrine of the passions shaped the Stoic therapy of the emotions, and his compatibilism shaped the entire subsequent history of the problem of free will.

Sources

• Stanford Encyclopedia of Philosophy, "Stoicism" (plato.stanford.edu/entries/stoicism)
• Internet Encyclopedia of Philosophy, "Stoicism" (iep.utm.edu/stoicism)
• Diogenes Laertius. Lives of the Eminent Philosophers, Book VII. Trans. Pamela Mensch. Oxford: Oxford University Press, 2018.
• Long, A.A., and D.N. Sedley. The Hellenistic Philosophers, vol. 1. Cambridge: Cambridge University Press, 1987.