The glaring gap in Dr. Collins's intellectual development from atheist to theist is his lack of knowledge of metaphysics. He falls for Stephen Jay Gould's idea that science and religion are two different "magisteriums" (Rocks of Ages: Science and Religion in the Fullness of Life). To understand evolution a scientist needs to know that there are three methods of inquiry: science, metaphysics, and theology. The existence of God and the concept of the human soul are formal results in metaphysics arising, respectively, from the two existential propositions that human being are different from one another and yet equal to one another. For this branch of knowledge, I recommend The One and the Many: A Contemporary Thomistic Metaphysics by Norris Clarke, S. J. Metaphysics helps us to understand evolution in two ways: 1) Evolution only applies to the bodies of human beings, not their souls. 2) Intelligent design (ID) is bad science, not because of its critique of natural selection, but because ID is metaphysics, not science.