Abstract

I respond to Michał Chaberek’s and Robert A. Delfino’s criticisms of my argument that evolution is compatible with Aristotelian-Thomistic metaphysics. Biological species, as secondary substances, are beings of reason founded in the natures of their instances. They are traceable to God’s creative intent, but not to universal exemplars. Aquinas teaches that concepts are derived from sensible accidents. Thus, evolution’s directed variation of such accidents will eventually require new species concepts. This accords with projective realism, which allows diverse, well-founded concepts based on the multiple perspectives and conceptual spaces of knowing subjects. Charges that this is nominalism, not moderate realism, are rebutted; however, it is relativism because knowledge is a subject-object relation. Other metaphysical issues are considered. Chaberek’s thesis that species cannot evolve naturally fails because he: (1) reifies the species concept, (2) misrepresents the motivation, structure and conclusions of evolution, (3) confuses Aristotle’s four causes and (4) limits God’s creative omnipotence. Finally, Chaberek is out of step with contemporary theology.