Abstract

This short chapter explores Aquinas’s teaching on the vegetative soul. At first glance, Aquinas does not seem too interested in the vegetative soul, and this type of soul certainly takes last rank compared with the sensory and the intellectual souls, which are of more relevance when it comes to human perfection and morality. However, this does not mean that Aquinas’s teaching on the vegetative soul lacks sophistication. The chapter first examines why there is a need to posit a vegetative soul in the first place. It then turns to the three main functions of the vegetative soul – nutrition, growth, and generation – and how they are related. After addressing in what sense, according to Aquinas, human beings possess a vegetative soul, the chapter closes with a reflection on the relative obscurity of the activities of the vegetative soul.