And God said unto Moses,
I AM THAT I AM:
and he said,
Thus shall you say unto the children of Israel, I AM has sent me unto you.
All Commentaries on Exodus 3:14 Go To Exodus 3
Augustine of Hippo
AD 430
He is the first and greatest existence, who is utterly unchangeable and who could say most perfectly, “I am who I am, and you shall say to them, “He who is has sent me to you.” As a result, the other things which exist could not exist except by him, and these things are good insofar as they have received the ability to be. .