John Chrysostom
God alone knows His own works completely. Therefore the Apostle added: "For who has known the mind of the Lord? Or who has been His counselor? Or who has first given to Him, that it should be repaid to him?" These words mean that God, being so wise, does not borrow wisdom from another, but is Himself the source of good things. He has done so much for us and granted so much to us, yet He did not give us what He borrowed from another. He poured it out from Himself. He is not obliged to repay anyone as though He had received something from another. He Himself is always the chief cause of good things.