Augustine of Hippo

But what did he see that time on the ladder? Angels ascending and descending. So also is the church, brothers; the angels of God, good preachers, preaching Christ; that is, they ascend and descend upon the Son of man. How do they ascend, and how do they descend? From one we have an example. Hear the apostle Paul; what we find in him, let us believe also about the rest of the preachers of truth. See Paul ascending: "I know a man in Christ who fourteen years ago (whether in the body or out of the body I do not know, God knows) was caught up to the third heaven, and heard unutterable words which it is not granted to man to speak." You heard him ascending; hear him descending: "I could not speak to you as spiritual men but only as carnal, as to little ones in Christ. I gave you milk to drink, not solid food." Look, he who had ascended descended. Seek where he had ascended: "Up to the third heaven." Seek where he had descended: "I became a little one," he says, "in your midst, as if a nurse were fondling her own children."