Augustine of Hippo

God is all-powerful, and, since he is all-powerful, he cannot die, he cannot be deceived, he cannot lie, and, as the apostle says, "he cannot disown himself." Very much he cannot do, yet he is all-powerful. It is because he cannot do these things for the very reason that he is all-powerful. If he could die, he would not be all-powerful. If he could lie, if he could be deceived, if he could deceive, if it were possible for him to do an injustice, he would not be omnipotent. If it were in him to do any of this, such acts would not be worthy of the Almighty. Absolutely omnipotent, our Father cannot sin.