The ancient philosophical concept of the 'good life' (eudaimonia in Greek, beatitudo or felicitas in Latin) was more practically grounded than modern philosophical treatments of happiness tend to be. Ancient ethics was primarily a question of how to live rather than a question of abstract moral principle.

Aristotle's Nicomachean Ethics is the most systematic ancient treatment. His argument — that eudaimonia consists in the excellent exercise of the distinctively human capacities, primarily reason, within a complete life — sets the terms for subsequent ancient ethical debate. The virtues (justice, courage, temperance, practical wisdom, and the intellectual virtues) are not commands to be obeyed but excellences to be developed through practice.

Epicurus' answer was more modest: eudaimonia consists in freedom from pain (ataraxia, tranquility) achieved through friendship, philosophy, and simple pleasures. The Epicurean withdrawal from politics and public life was controversial in a culture that defined virtue through civic participation.

The Stoic answer was most radical: eudaimonia is entirely a matter of virtue, which is entirely within our control. External circumstances — health, wealth, reputation — are 'preferred indifferents': nice to have, but their absence doesn't diminish the good life of the virtuous person. This extreme position was internally consistent but struck most ancient critics as either heroically demanding or dishonestly detached from reality.