Abstract

It is undeniable that Thomas Aquinas showed great metaphysical originality among his contemporaries. However, his advances concerning the meaning of the uniqueness of the substantial form cannot be adequately grasped independently of an equally original understanding of matter, conceived in particular as pure power. This study attempts to grasp the implications of the Thomasian conception of matter in the various fields of his thought, from physics to metaphysics, passing through the foundations, in the very constitution of substance, theories of knowledge, of moral action and apprehension of the beautiful. We discover a conception of the substance-subject in the strong sense which nevertheless shows itself, at the very heart of its constitutive principles, radically open to the originality of Otherness in its various forms.