After Alexander the Great died in 323 BCE, his empire split into kingdoms ruled by his generals. The independent polis lost much of its power, and Greek culture spread across a vast world from Egypt to Afghanistan. This is the Hellenistic age. Philosophy changed with it. The great questions became more personal: how can an individual live well and find peace of mind in a large, uncertain world? Several schools offered rival answers, and each was a way of life as much as a theory.

The Cynics

The Cynic movement actually began a little earlier; ancient tradition traces it to Antisthenes, a follower of Socrates, though scholars debate the link. But their most famous figure is Diogenes of Sinope (fourth century BCE). Diogenes taught that happiness comes from living according to nature and rejecting convention: wealth, status, manners and social rules are artificial burdens. He lived in a large storage jar in Athens, owned almost nothing and behaved shamelessly in public to make his point. The name “Cynic” comes from the Greek for “dog-like.” Stories about him, collected centuries later by Diogenes Laertius, are famous: asked where he came from, he said he was a citizen of the world (kosmopolites); when Alexander offered him any favor, he asked the king to stand out of his sunlight. Critics found the Cynics rude, but their challenge to empty status still bites.

The Epicureans

Epicurus (341 to 270 BCE) founded a community in Athens called the Garden, which welcomed women and slaves. He taught that pleasure is the good, but by pleasure he meant mainly the absence of pain in the body and of trouble in the mind (ataraxia), not luxury. Simple food, friendship and philosophy bring more lasting pleasure than feasts and ambition, which produce anxiety. Epicurus adopted the atomism of Democritus to free people from fear. The gods, if they exist, do not interfere in our lives, and at death our atoms scatter, so there is nothing to suffer. “Death is nothing to us,” he wrote, because when we exist death is not present, and when death is present we do not exist. The Roman poet Lucretius later set these ideas in a great poem, On the Nature of Things.

Critics, then and now, charged Epicureans with selfishness and with withdrawing from public duty, since Epicurus advised avoiding politics. The word “epicure” for a lover of fine food is a distortion of his actual teaching.

The Stoics, briefly

Zeno of Citium began teaching around 300 BCE in the Painted Porch (Stoa Poikile) in Athens, giving the school its name. The Stoics taught that virtue is the only true good, that the cosmos is ordered by a rational principle, and that we should live in agreement with nature, accepting what we cannot control. Stoicism later flourished in Rome with Seneca, Epictetus and Marcus Aurelius, and it has its own course in this school.

The Skeptics

Pyrrho of Elis (about 360 to 270 BCE), who traveled with Alexander's army to India, is regarded as the founder of skepticism. Skeptics noted that for every argument there seems to be an equally strong opposing argument, and that our senses and customs differ. The wise response is to suspend judgment (epoche), and from that suspension, they said, comes tranquility. Later, Plato's own Academy turned skeptical under Arcesilaus and Carneades, who argued against the Stoic claim that some impressions are certain.

The obvious objection is that no one can live without beliefs: you must decide whether to eat the bread or cross the road. Skeptics replied that one can follow appearances and custom in daily life without claiming certain knowledge. Their arguments shaped later debates on knowledge for two thousand years.

Worked example: four schools face a loss

Imagine a merchant in Hellenistic Alexandria whose ship sinks, taking most of his fortune with it. He visits four philosophers for advice.

The Cynic laughs kindly and says: “Good. You have lost the thing that owned you. A dog needs no warehouse. Live simply, by nature, and you can never be robbed again.”

The Epicurean invites him to dinner in the Garden: bread, cheese, water and good conversation. “The pleasure you need is freedom from pain and worry. Your fortune brought you sleepless nights. Friends and a quiet mind cost little, and no storm can sink them.”

The Stoic says: “The ship was never truly in your power. Your judgment and your character are. Grieve if you must, but do not think a misfortune has harmed your virtue, the only real good.”

The Skeptic asks: “Are you certain this is a disaster? Some who lost fortunes found a better life; some who kept them were ruined. Since you cannot know, suspend judgment, and some of the weight will lift.”

Notice what the four share: each treats philosophy as a therapy for distress, and each locates happiness in something within the merchant's control rather than in luck. Notice also how they differ. The Cynic attacks social convention itself; the Epicurean seeks a modest, pleasant life among friends; the Stoic points to virtue; the Skeptic points to the limits of knowledge. A merchant who heard all four would have a lot to think about on the walk home.