Gregory the Great
Catena Aurea · Johannesevangelium 16
But now I go my way to him that sent me; and none of you asketh me, Whither goest thou? But because I have said these tilings unto you, sorrow hath filled your heart. Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you. And when he is come, he will reprove the world of sin, and of righteousness, and of judgment: Of sin, because they believe not on me; Of righteousness, because I go to my Father, and ye see me no more; Of judgment, because the prince of this world is judged.
(viii. Moral. c. xvii.) As if He said plainly, If I withdraw not My body from your eyes, I cannot lead you to the understanding of the Invisible, through the Comforting Spirit.