Thomas Aquinas on Bodily Identity

Abstract

This is a study of the union of matter and the soul in human beings in the thought of the Dominican Thomas Aquinas. At first glance, this issue might appear arcane, but it was at the centre of Catholic polemic with heresy in the thirteenth century and of the development of medieval thought. The book argues that theological issues, especially the need for an identical body to be resurrected at the end of time, were vital to Aquinas’s account of how human beings are constituted. The book explores how theological questions shaped Aquinas’s thought on individuality and bodily identity over time, his embryology and understanding of heredity, his work on nutrition and bodily growth, and his fundamental conception of matter. It demonstrates how Aquinas used his peripatetic sources, Aristotle and Averroes, to further his own thinking. The book indicates how Aquinas’s thought on bodily identity became pivotal to university debates and relations between rival mendicant orders in the late thirteenth and early fourteenth centuries, and that quarrels surrounding these issues persisted into the fifteenth century. Not only is this a study of the interface between theology, biology, and physics in Aquinas’s thought; it also fundamentally revises the generally accepted view of Aquinas. Aquinas is famous for holding that the only substantial form in a human being is the soul; most scholars have therefore thought he located the identity of the individual in their soul. This book restores the body through a thorough examination of the range of Aquinas’s works.