In this lecture, the fourth of nine, we consider whether God is a mixture of good and evil, with a light side and a dark side. Thomas argues that reason alone shows that the Uncaused Cause cannot be composed of anything, and so cannot be partly good and partly evil. Moreover, we look at Thomas’s teaching that there cannot be more than one Uncaused Cause, and that the Uncaused Cause is the very same as the Unmoved Mover, the absolutely Necessary being, the Greatest Good, and the Intelligence that gives order to nature. We also examine various challenges that can be raised against Aquinas’s views.