Ezekiel 2:1

"Son of man, stand upon your feet, and I will speak with you." The order of speech and work must be noted by us, because first the likeness of the glory of the Lord appears in order to cast down, afterward He addresses in order to raise up, then He sends the spirit of superabundant grace and lifts up, and sets upon the feet. For unless we saw something of eternity in our mind, we would never fall upon our face in repentance. But already as we lie prostrate the voice of the Lord consoles us so that we may rise in work, which nevertheless we cannot do by our own power. Therefore His spirit fills and lifts us, and sets us upon our feet, so that we who lay prone in penitence for our fault may afterward stand upright in good work.

But we must ask why Ezekiel and Paul fall on their face, while of the horseman, that is, of him who is exalted in the glory of this world, it is said: "That his rider may fall backward." And again of the persecutors of the Lord it is written: "They went backward and fell to the ground." What does this mean, that the elect fall forward and the reprobate fall backward, except that everyone who falls behind himself doubtless falls where he does not see, while he who falls before himself falls where he sees? Therefore the wicked, because they fall into invisible things, are said to fall backward, because they collapse where they cannot now see what will then follow them. But the just, because they willingly cast themselves down in these visible things so that they may be raised up in invisible things, fall as it were on their face, because, pierced with fear, they are humbled while seeing.

Hence it is also rightly said through the Psalmist concerning "Stand upon your feet": "He brought me up out of the pit of misery, and out of the miry clay; He set my feet upon a rock and directed my steps; and He put a new song in my mouth, a hymn to our God." For first he is brought out of the mire of wickedness, so that his feet may be made solid upon the rock through faith. But because right action should follow right faith, his steps were directed, so that after the directing of his steps, that is, after the perfection of good work, he might receive in his mouth also the new song of preaching. Thus Saul, while he was going proudly to Damascus, lay prostrate, struck down by the voice of the Redeemer. And he who was to be a future preacher did not immediately hear that he should preach what he had seen, but to him lying there it is said: "Enter into the city, and it will be told you what you must do." Therefore lying down he could only hear this: that rising he should learn what he would hear; but rising he learned this: that he should preach what he had come to know.