Catena Aurea on John 18:3–9: Gregory the Great

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.