“The Stoics also articulated the mood that we should aspire to as our default setting—ataraxia (literally, ‘without disturbance’)—a carefully calibrated state of tranquillity that is not happiness, or joy, or any of the ecstatic states found in religious or mystical experiences, or in the more modern highs of falling in love or taking cocaine. Instead, ataraxia is a state of contentment or peace where the world can be falling in around your ears, but your equilibrium is undisturbed.”