Hilary of Poitiers
Catena Aurea · Johannesevangelium 5
If I bear witness of myself, my witness is not true. There is another that beareth witness of me; and I know that the witness which he witnesseth of me is true. Ye sent unto John, and he bare witness unto the truth. But I receive not testimony from man: but these things I say, that ye might be saved. He was a burning and a shining light: and ye were willing for a season to rejoice in his light. But I have greater witness than that of John: for the works which the Father hath given me to finish, the same works that I do, bear witness of me, that the Father hath sent me. And the Father himself, which hath sent me, hath borne witness of me. Ye have neither heard his voice at any time, nor seen his shape. And ye have not his word abiding in you: for whom he hath sent, him ye believe not. Search the Scriptures; for in them ye think ye have eternal life: and they are they which testify of me. And ye will not come to me, that ye might have life.
(vi. de Trin. c. 27) The Only-begotten God shews Himself to be the Son, on the testimony not of man only, but of His own power. The works which He does, bear witness to His being sent from the Father. Therefore the obedience of the Son and the authority of the Father are set forth in Him who was sent. But the testimony of works not being sufficient evidence, it follows, And the Father Himself which hath sent Me, hath borne witness of Me. Open the Evangelic volumes, and examine their whole range: no testimony of the Father to the Son is given in any of the books, other than that He is the Son. So what a calumny is it in men now saying that this is only a name of adoption: thus making God a liar, and names unmeaning.