Caesarius of Arles : Moses performed no sign without the mysterious wood, for he received from the Lord a rod to work wonders and prodigies in Egypt. Moreover, as a sign that he had heard things divinely, it was said to him, "Lift up your staff." God, of course, did not need the assistance of a staff. But it was raised so that we might know how great was the mystery of that future wood which was prefigured by the shadow of this staff. — SERMON 112.4