ELI5: Explain Like I'm 5

Divine simplicity

Divine simplicity is the idea that God is so pure and perfect that all of His parts are all the same. It means that God is One, and is not divided into different parts. He does not have a body or a brain, or any emotions. He is simple and perfect and indivisible. So, in other words, if you could imagine the most perfect thing in the whole universe, that would be a good way to think of God.