ataraxia

noun

1. (Greek, literary, uncountable, usually)Tranquility of mind; absence of mental disturbance.

   “And what happineſs is there in a ſtorm of paſſions? On this account the Scepticks affected an indifferent æquipondious neutrality as the only means to their Ataraxia, and freedom from paßionate diſturbances.”

   “O, for that apathy of soul, that sweet ataraxia, of which I have heard, which forbids alike the approaches of pleasure and pain, hope and despair!”

   “That terrible Latin poet Lucretius, whose apparent serenity and Epicurean ataraxia conceal so much despair, said that piety consists in the power to contemplate all things with a serene soul—pacata posse mente omnia tueri.”

   “[…] he was an Epicurean not in the commonly misunderstood sense, as a seeker after luxury, but in the true meaning, as a pursuer of what the Greeks call ataraxia, or freedom from disturbance.”

   “Once they’d seen that the world is nothing but atoms and void, and that we simply disintegrate after death, and so have no need to fear the Torments of Hell, they would be in a better position to cultivate ataraxia—the Greek word for the calm, unruffled composure that was the Epicurean ideal.”