Stoicism is an ancient Greek and Roman philosophy founded in Athens around 300 BCE by Zeno of Citium, later developed by thinkers such as Epictetus, Seneca, Marcus Aurelius, and Musonius Rufus into a complete guide to living well. Its central claim — that virtue is the only true good and that lasting happiness comes from what is within our control — makes it uniquely practical for navigating modern life: stress, career pressure, loss, and uncertainty. What distinguishes Stoicism from mere self-help is its integration of ethics, logic, and a cosmological view of human beings as rational parts of a larger whole; mastering even one core concept tends to shift your entire relationship to adversity.
What This Cheat Sheet Covers
This topic spans 17 focused tables and 95 indexed concepts. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.
Table 1: The Dichotomy of Control
The foundational Stoic insight is the sharp distinction between what is genuinely "up to us" (eph' hēmin) and what is not. Everything else in Stoicism grows from this single root, described by Epictetus in Enchiridion 1 and developed further throughout the Discourses.
| Concept | Example | Description |
|---|---|---|
Your thoughts and judgments are up to you; traffic, other people's opinions, and illness are not | Epictetus's core teaching: only our judgments, impulses, desires, and aversions are fully "up to us"; everything external is not up to us and should be accepted rather than fought. | |
How you respond to a harsh email; whether you act with patience today | The domain of the Stoic's power: voluntary actions and how we think about things — judgments, desires, aversions, and our chosen responses. | |
Your reputation, weather, the economy, other people's reactions | External events, the body, property, and outcomes; not bad in themselves — they are indifferent; only our judgments about them cause distress. |