ataraxia

Ataraxia (ἀταραξία, alpha privative negation of tarachê -- disturbance, trouble; hence, "unperturbedness", generally translated as "imperturbability", "equanimity", or "tranquility") is a Greek term first used in Ancient Greek philosophy by Pyrrho and subsequently Epicurus and the Stoics for a lucid state of robust equanimity characterized by ongoing freedom from distress and worry. In non-philosophical usage, the term was used to describe the ideal mental state for soldiers entering battle. Achieving ataraxia is a common goal for Pyrrhonism, Epicureanism, and Stoicism, but the role and value of ataraxia within each philosophy varies in accordance with their philosophical theories. The mental disturbances that prevent one from achieving ataraxia vary among the philosophies, and each philosophy has a different understanding as to how to achieve ataraxia. https://en.wikipedia.org/wiki/Ataraxia