4. As John says that he saw, so, too, wrote Mark; Luke, however, added that the Holy Spirit descended in a bodily form as a dove; you must not think that this was an incarnation, but an appearance. He, then, brought the appearance before him, that by means of the appearance he might believe who did not see the Spirit, and that by the appearance He might manifest that He had a share of the one honour in authority, the one operation in the mystery, the one gift in the bath, together with the Father and the Son; unless perchance we consider Him in Whom the Lord was baptized too weak for the servant to be baptized in Him.