Abstract

Aquinas’ philosophy is revolutionary, especially his doctrine of essence within the context of natural philosophy has transcended that of Aristotle. The principal distinctions between the doctrines of Aquinas and Aristotle are demonstrated in four layers which are entity-nature, compositeness, particularity and potentiality of essence. Aquinas not only overturns and reforms the Western traditional view of essence, but also constructs a prominent “joint” connecting essentialism to existentialism in Western philosophy.