St Thomas Aquinas (1225-1274) saw religion as part of the natural human propensity to worship. His ability to recognize the naturalness of this phenomenon and simultaneously to go beyond it, to explore spiritual revelation, makes his work fresh and highly readable today. While drawing on a strong distinction between theology and philosophy, Aquinas interleaved them intricately in his writings, which range from an examination of the structures of thought to the concept of God as the end of all things. This translation chooses substantial passages not only from the Summa Theologiae, but from many other works, illustrating the breadth and progression of Aquinas' philosophy. Timothy McDermott has also edited St Thomas Aquinas: Summa Theologiae: A Concise Translation.