A Plea to Thomists: Will the Real Darwinian Please Stand Up? On Some Recent Defenses of the Fifth Way

In this paper, we discuss with some contemporary Thomists the possibility of re-actualizing Thomas’s fifth way to God in the science–theology dialogue. We start with a reference to Spinoza’s critique of teleology in light of some recent Spinoza studies, and after summarizing several Thomistic defenses of Aquinas’s teleological argument, we interpret that critique as targeting the fifth way as well. We then focus on Darwin’s impact on biological design arguments. We argue that his naturalistic explanation of biological teleology also affects the fifth way. The distinction between internal-Aristotelian and external-Platonic conceptions of teleology does not seem to be able to protect the teleological argument from a Darwinian critique. We conclude by stressing the importance and fruitfulness of Thomas’s thought for contemporary interdisciplinary dialogue, provided that Darwin’s impact on the biological version of the fifth way is taken into due account.