Lesson Fourteen in Introduction to Thomistic Philosophy, with Fr Dominic Legge, OP, JD, STL, STD, Assistant Professor of Systematic Theology and Director of the Thomistic Institute.
Unlike every creature, God simply is. God is Being itself, and therefore absolutely uncaused. He is not simply in our world, he is the cause of our world. All things fundamentally depend on God for their very being. Therefore, God is a different type of cause than every other thing because he gives to other causes their very being.