Gregory the Great
Catena Aurea · Johannesevangelium 18
Judas then, having received a band of men and officers from the chief priests and Pharisees, cometh thither with lanterns and torches and weapons. Jesus therefore, knowing all things that should come upon him, went forth, and said unto them, Whom seek ye? They answered him, Jesus of Nazareth. Jesus saith unto them, I am he. And Judas also, which betrayed him, stood with them. As soon then as he said unto them, I am he, they went backward, and fell to the ground. Then asked he them again, Whom seek ye? And they said, Jesus of Nazareth. Jesus answered, I have told you that I am he: if therefore ye seek me, let these go their way: That the saying might be fulfilled, which he spake, Of them which thou gavest me have I lost none.
(Ezech. Hom. ix.) Why is this, that the Elect fall on their faces, the reprobate backward? Because every one who falls back, sees not where he falls, whereas he who falls forward, sees where he falls. The wicked when they suffer loss in invisible things, are said to fall backward, because they do not see what is behind them: but the righteous, who of their own accord cast themselves down in temporal things, in order that they may rise in spiritual, fall as it were upon their faces, when with fear and repentance they humble themselves with their eyes open.