A magisterial mappa mundi of the terrain that Pierre Hadot has so productively worked for decades, this ambitious book revises our view of ancient philosophy - and in doing so, proposes that we change the way we see philosophy itself. Hadot takes ancient philosophy out of its customary realm of names, dates, and arid abstractions and plants it squarely in the thick of life. Through a meticulous historical reading, he shows how the various schools, trends, and ideas of ancient Greek and Roman philosophy all tended toward one goal: to provide a means for achieving happiness in this life, by transforming the individual's mode of perceiving and being in the world.