Abstract

The biggest obstacle to understanding Aquinas's account of the soul may be the word “soul”. On hearing it, many people are prone to think of ghosts, ectoplasm, or Rene Descartes's notion of res cogitans. None of these has anything to do with the soul as Aquinas understands it. But even the standard one‐line Aristotelian‐Thomistic characterization of the soul as the form of the living body can too easily mislead. As is well known, the word “soul” is in Aristotelian‐Thomistic philosophy essentially a technical term for the substantial form of a living thing. Material substances can be destroyed by other natural objects because they do have an inherent tendency toward corruption. A human being is the kind of substance which, in its mature and normal state, exhibits both the properties and causal powers characteristic of animality and those characteristic of rationality.