One of the most influential philosophers and theologians in the history of Western thought, St Thomas Aquinas established the foundations for much of modern philosophy of religion, and is famous for his arguments for the existence of God. In this cogent and multifaceted introduction to the great saint's work, Edward Feser argues that you cannot fully understand Aquinas's philosophy without his theology and vice-versa. Covering his thoughts on the soul, natural law, metaphysics, and the interaction of faith and reason, this will prove an indispensible resource for students, experts or the general reader.