Acts 5:15

Wilt thou that I show thee this also from the Apostles more obviously to the sense. Consider Paul, whose garments wrought: Peter, whose very shadows were mighty. For had they not borne a King's image and their radiancy been unapproachable, their garments and shadows had not wrought so mightily. For the garments of a king are terrible even to robbers. Wouldest thou see this beaming even through the body? "Looking steadfastly," said he, "upon the face of Stephen, they saw it as it had been the face of an angel." But this was nothing to the glory flashing within. For what Moses had upon his countenance, that did these carry about with them on their souls, yea rather even far more. For that of Moses indeed was more obvious to the senses, but this was incorporeal.

So that as Peter came along, at least his shadow might fall on some of them and they would be healed. At that time, Peter visibly raised the sick with the shadow of his body, and even now he does not cease to strengthen the infirmities of the faithful with the invisible shadow of his intercession. And since Peter is the type of the Church, he indeed walks upright himself, but by his shadow accompanying him he raises those that lie down, because the Church, with its mind and love intending towards heavenly things, seemingly runs through the earth shadow-like, and here renews those by temporal sacraments and figures of heavenly things, whom it rewards there with perpetual gifts. Some connect to this place what the Lord said in the Gospel: He who believes in me will do the works that I do, and greater works than these will he do (John 14).

We dwell in the church on earth, which, no one may doubt, signifies a heavenly [church]; but that is more truly [the church] which, at rest above the stars, is called celestial and high. This [earthly church], which is seen in the brief career of an uncertain world, is appointed as the way of life and in this [present] time directs to the eternal [church] those whom it gathers, and to those found acceptable it is the road for going from here to heavenly things. Peter rules both armies, and for their lot he gives the stars to those squadrons led from here, as has been revealed by the words of God, "What you have loosed," he said, "and what you bind on earth thus remain bound or loosed in heaven." This [church] that we see cultivated on soil, therefore, will be a type; what the clouds carry is firm. Peter, ruling both, designs there the body and here the shadow, in order that those sick people whom he freed from vices and offenses might be led unharmed to it [the church above], which endures in heaven [and] will receive the holy throngs cleansed by this [earthly church].