Abstract

Aristotle was usually thought to have given two definitions of the soul in the second book of De Anima. The second of these calls it “that by which we live, feel, and think”.1 Of the soul’s three par ts, the vegetative is that by which we live, the sensitive that by which we feel, the rational that by which we think. Human souls have all three parts; animals the vegetative and sensitive; plants only the vegetative.