Spinoza on Causa Sui

For many of Spinoza's contemporaries and predecessors the very notion of causa sui was utterly absurd, akin to a Baron Munchausen attempting to lift himself above a river by pulling his hair up. This chapter examines Descartes’ engagement with the notion of causa sui, and shows that Spinoza understood the causation of causa sui as efficient, and not formal, causation. Proving the existence of God was the stated aim of Descartes’ Third Meditation. Descartes’ response to Caterus is pretty simple: he denies that efficient causation must be spread in time. Descartes’ surprising response to Caterus drew the attention of Antoine Arnauld, the author of the Fourth Set of Objections, and, at the time, a doctoral student of theology at the Sorbonne. The young Spinoza must have watched Descartes’ struggle with the notion of causa sui with great interest.