Stoicism

Stoicism, founded by Zeno of Citium around 300 BCE, holds that virtue is the only true good and that everything else — health, wealth, reputation — is indifferent. What matters is the quality of our judgements and intentions. Through Epictetus, Seneca, and Marcus Aurelius, Stoicism became the most practically influential philosophy of the ancient world, and its revival in contemporary culture speaks to its enduring relevance.