Book excerpt: Thomas Aquinas was one of the greatest Western philosphers and one of the greatest theologians of the Christian church. In this book we at last have a modern, comprehensive presentation of the total thought of Aquinas. Books on Aquinas invariably deal with either his philosophy or his theology. But Aquinas himself made no arbitrary division between his philosophical and his theological thought, and this book allows readers to see him as a whole. It introduces the full range of Aquinas' thinking; and it relates his thinking to writers both earlier and later than Aquinas himself.