The philosophy asserts that virtue {meaning, chiefly, the four cardinal virtues of self-control, courage , justice , and wisdom} is happiness, and it is our perceptions of things- rather than the things themselves- that cause most of our trouble. Stoicism teaches that we can't control or rely on anything outside what Epictetus called our "reasoned choice"- our ability to use our reason to choose how we categorize, respond, and reorient ourselves to external events.
( Ryan Holiday )
[ The Daily Stoic: 366 ]
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