Oppy on Thomistic cosmological arguments

Graham Oppy has criticized several Thomistic versions of the cosmological argument in a series of publications over the years, most recently in a Religious Studies article responding to my book Five Proofs of the Existence of God. Here I reply to his criticisms, arguing that while Oppy raises important issues, a besetting weakness of his approach is a failure adequately to grapple with the metaphysical underpinnings of the arguments.