This book is a study of the role of intellect in human action as described by Thomas Aquinas. One of its primary aims is to compare the interpretation of Aristotle by Aquinas with the lines of interpretation offered in contemporary Aristotelian scholarship. The book seeks to clarify the problems involved in the appropriation of Aristotle's theory of practical reason by a Christian theologian, including such topics as the practical syllogism and the problems of akrasia.

Professor Westberg argues that Aquinas was closer to Aristotle than is often recognized; and he puts forward important new interpretations of the relation of intellect and will in human action, and on the division of the process of action in the stages of intention, deliberation, decision, and execution. In the concluding section of the book, he shows how this new interpretation yields fruitful insights on a range of theological topics, including sin, law, love, and the moral virtues.