Abstract

The present essay takes up matters discussed by Robert Pasnau in his response to our previous criticism of his account of Aquinas's view of when a foetus acquires a human soul. We are mainly concerned with metaphysical and biological issues and argue that the kind of organization required for ensoulment is that sufficient for the full development of a human being, and that this is present from conception. We contend that in his criticisms of our account Pasnau fails clearly to distinguish first, between a passive potentiality and an active capacity; second, between having a power intrinsically and being an instrumental agent of that which has it intrinsically; third, between per accidens and per se causal series; and fourth, between sense cognition and conceptual thought. We conclude that philosophy and embryology support the position that human beings exist from the point of conception