The Uncaused Cause of Change

If you think that you have already proved the existence of God, you will not have proved everything. It's tempting to think like this: Hooray! There's an uncaused cause of change. God exists. His son Jesus is my personal savior. The Catholic Church is here to provide me with the fullness of the means of salvation. But if you think that Aquinas has jumped the gun and it's not right to start using the word God yet, this gives you even more reason to go on. You want to learn more about this extraordinary being. He might turn out to be so extraordinary that it would be worth calling it God.