Abstract

In the Third Meditation, Descartes suggests that God, and only God, is self-caused. This claim results in objections, first from Caterus and then from Arnauld, that an efficient cause must be distinct from its effect, and therefore the notion of self-causation is unintelligible. In the course of his reply to Arnauld, Descartes distinguishes between a formal cause and an efficient cause, contends that God's essence is properly the formal cause of God's existence, and attempts to find a cause midway between a formal cause and an efficient cause.