De Synodis 32

II. "And if any one hearing the Son say, As the Father hath life in Himself, so also hath He given to the Son to have life in Himself, shall say that He who has received life from the Father, and who also declares, I live by the Father, is the same as He who gave life: let him be anathema." 14. The person of the recipient and of the giver are distinguished so that the same should not be made one and sole. For since he is under anathema who has believed that, when recipient and giver are mentioned one solitary and unique person is implied, we may not suppose that the selfsame person who gave received from Himself. For He who lives and He through whom He lives are not identical, for one lives to Himself, the other declares that He lives through the Author of His life, and no one will declare that He who enjoys life and He through whom His life is caused are personally identical.