One of the reasons why the doctrine of Divine Simplicity is so important is because once we know that God is simple, we can also know other important attributes about God.
For example, from the notion that God does not consist of parts we can also know that there is only One God who must be an Immaterial, Immutable and Unchanging being who is His own existence (meaning that He exists “a se” or from Himself) and cannot be caused by another.
In this quick video, I’ll explain why reason shows that these attributes must also be true of God.
Want to learn more about the philosophy of St. Thomas Aquinas? Here’s a great place to start:
Get the Introduction To The Philosophy of St. Thomas Aquinas program available here.