Stoicism

Among all the philosophical schools of Antiquity, none exercised so prolonged and so diverse an influence as Stoicism. Founded in Athens around 300 BCE by Zeno of Citium, Stoicism spanned five centuries, shaped Roman law, infiltrated early Christianity, and resurfaced powerfully in the Renaissance, the Enlightenment, and — more recently — in cognitive-behavioral therapy and philosophical self-help movements. The reason for this longevity is simple: Stoicism offers a coherent and practicable answer to the most urgent question of human existence — how to live well in a world we do not control. ...

Chrysippus of Soli (c. 280–c. 207 BCE) was the third scholarch (head) of the Stoic school in Athens and is considered, alongside Zeno of Citium, the second founder of Stoicism. While Zeno founded the school and established its fundamental theses, it was Chrysippus who systematically elaborated Stoic logic, physics, and ethics, producing a monumental body of work that ancient tradition estimated at over 700 titles — almost all now lost. What we know of his thought comes from secondary sources: Diogenes Laërtius, Plutarch, Cicero, Sextus Empiricus, and Epictetus. ...

Cicero Roman philosopher, orator, and statesman. The most important figure in transmitting Greek philosophy to the Latin world. His eclecticism synthesized Epicureanism, Stoicism, and the skepticism of the New Academy. He coined much of the Latin philosophical vocabulary — essentia, qualitas, moralis — that shaped all subsequent Western philosophy. Key Concepts Natural law: there is a universal moral law, grounded in reason, that transcends the positive laws of each people — the foundation of Western natural law theory Res publica: the republic as “the people’s affair” (res populi); the state is only legitimate when it serves the common good and respects the law Duty (officium): ethical life consists in fulfilling duties arising from reason, human social nature, and the roles each person occupies — systematized in De Officiis Academic probabilism: influenced by the skepticism of the New Academy, he argues that in the absence of certainty we should act according to what seems most probable (verisimile) Humanitas: the ideal of full human formation combining philosophy, rhetoric, and civic virtue; the Roman equivalent of the Greek paideia Highest good (summum bonum): debate among schools — for Stoics, virtue; for Epicureans, pleasure. Cicero leans toward Stoicism but presents arguments from all schools Influenced by Plato and Aristotle — politics, ethics, theory of knowledge Zeno of Citium — Stoicism (cosmopolitanism, natural law, duty) Epicurus — addressed critically Carneades — skepticism of the New Academy Influenced Augustine and all medieval philosophy — Latin vocabulary and natural law Thomas Aquinas — natural law theory Machiavelli, Montesquieu, Rousseau — republican theory Locke and Kant — natural rights and moral duty Renaissance humanism — ideal of humanitas Works On the Republic (De Re Publica, 54 BC); On the Laws (De Legibus, 52 BC); Tusculan Disputations (Tusculanae Disputationes, 45 BC); On Duties (De Officiis, 44 BC); On the Nature of the Gods (De Natura Deorum, 45 BC). ...

Epictetus Phrygian ex-slave; the Stoic who most lived what he preached. His central distinction structures all Stoic ethics: what depends on us (eph’ hêmin: thoughts, impulses, judgments, desires) vs. what does not depend on us (ouk eph’ hêmin: body, fame, wealth, health). Inner freedom is absolute and cannot be taken by any master. “Bear and forbear” (anékhou kai apékhou). Born in Hierapolis, in Phrygia (modern Turkey), Epictetus spent his early years as a slave in Rome, in the service of Epaphroditus, a freedman connected to Nero’s court. It was in this setting that he studied under the Stoic Musonius Rufus, from whom he inherited the conviction that philosophy is worth only as much as it transforms conduct. He is said to have been lame — a condition he reportedly mentioned with serene indifference, a living example of his doctrine that disability touches the body, not the prohairesis, the will that chooses. Freed later in life, he devoted himself to teaching in Rome until the emperor Domitian expelled the philosophers from the city; he then moved to Nicopolis, in Epirus (northwestern Greece), where he founded a school that drew disciples from far and wide, including young men of the Roman elite. ...

Marcus Aurelius Marcus Aurelius Antoninus ruled Rome from 161 to 180 CE and is remembered as the last of the “Five Good Emperors” and as the most celebrated example of the ancient ideal of the philosopher-king. Adopted into the line of succession by Antoninus Pius, he received a careful education and turned early to Stoicism, above all through reading Epictetus, to whom he had been introduced by his teacher Junius Rusticus. His reign, far from peaceful, was beset by wars on the Danube frontier, by revolts, and by the devastating Antonine Plague — circumstances in which his philosophy proved less a doctrine than a discipline of inner survival. ...

Seneca Lucius Annaeus Seneca was born in Corduba, in Hispania, around 4 BCE, the son of Seneca the Elder, a renowned teacher of rhetoric. He was the most influential — and also the most controversial — of the Roman Stoics: a wealthy and powerful senator, he endured exile in Corsica under the emperor Claudius and, on his return to Rome, became tutor and later advisor to the young Nero, whom he sought to restrain in the early years of his reign. Accused of taking part in the Pisonian conspiracy, he was forced by Nero to take his own life in 65 CE — a death that, according to Tacitus’s account, he faced with the serenity his philosophy preached. ...

Zeno of Citium Founder of Stoicism. He taught at the Stoa Poikilê (Painted Porch) in Athens — hence the name of the school. After hearing the story of Socrates through the cynicism of Crates, he abandoned commerce to dedicate himself to philosophy. He taught that virtue is the only real good; everything else (wealth, health, fame) is indifferent (adiaphora). The universe is permeated by the divine Logos (rational fire) and each event occurs by rational necessity. ...