Augustine of Hippo — as excerpted in the Catena Aurea on John 5:19-20

“(Tr. xviii. 3, 5) Some who would be thought Christians, the Arian heretics, who say that the very Son of God who took our flesh upon Him, was inferior to the Father, take advantage of these words to throw discredit upon our doctrine, and say, You see that when our Lord perceived the Jews to be indignant, because He seemed to make Himself equal with God, He gave such an answer as shewed that He was not equal. For they say, he who can do nothing but what he sees the Father do is not equal but inferior to the Father. But if there is a greater God, and a less God, (the Word being God,) we worship two Gods, and not onee.”