Augustine of Hippo

The only thing the Almighty cannot do is what he does not will, in case anybody should consider it was very rash of me to say that the Almighty "cannot" do something. The blessed apostle said it too, "If we do not believe, he remains faithful, for he cannot deny himself." But it is because he does not wish to that he cannot do it, because he cannot even have the will to. Justice, after all, cannot have the will to do what is unjust, or wisdom will what is foolish, or truth will what is false.