Genesis 18:21

It was not that God, who had just said, "their sins were very grave," did not know that they had sinned. This was an example to judges not to prejudge a case, even based on very reliable hearsay.

Then, to teach the whole human race that even if their sins are exceedingly great and confessed to be such, he does not pronounce sentence before proof is manifest, he says, "I am going down to see if their deeds correspond to the outcry reaching me, so as to know if it is true or not." What is meant by the deliberation of the expression? "I am going down to see if their deeds correspond to the outcry reaching me, so as to know if it is true or not." What is meant by the considerateness of the expression? "I am going down to see." I mean, does the God of all move from place to place? No indeed! It doesn't mean this; instead, as I have often remarked, he wants to teach us by the concreteness of the expression that there is need to apply precision and that sinners are not condemned on hearsay nor is sentence pronounced without proof.

Now let us see what he means by saying, "I descended to see whether they have done all that the outcry which has come to me indicates; if not, I will know."

The cry of Sodom and Gomorrah is multiplied, he said. Well did he say that sins can cry out. Great surely is the cry of sinners as it mounts from earth to heaven. But why does he say that the sins of people cry out?

These are the words of the divine Scripture. Let us see, therefore, now what is fitting to be understood in them. "I have descended," the text says, "to see." When responses are delivered to Abraham, God is not said to descend but to stand before him, as we explained above: "Three men," the text says, "stood before him." But now, because sinners are involved, God is said to descend. Beware lest you think of ascending and descending spatially. For this is frequently found in the sacred literature, as in the prophet Micah: "Behold," Scripture says, "the Lord departed from his holy place and came down and will tread upon the high places of the earth." Therefore God is said to descend when he deigns to have concern for human frailty. This should be discerned especially of our Lord and Savior, who "thought it not robbery to be equal with God but emptied himself, taking the form of a servant." Therefore he descended. For "no other has ascended into heaven, but he that descended from heaven, the Son of man who is in heaven." For the Lord descended not only to care for us but also to bear these things that are ours. "For he took the form of a servant," and although he himself is invisible in nature, inasmuch as he is equal to the Father, nevertheless he took a visible appearance "and was found in appearance as a man." But also when he descends he is below with some, but he ascends with others and is above. For he goes up with the chosen apostles "into a high mountain and there is transfigured before them." Therefore he is above with those whom he teaches about the mysteries of the kingdom of heaven. But he is below with the crowds and Pharisees, whose sins he reproaches, and he is there with them.… He could not, however, be transfigured below, but he ascended above with those who could follow him, and there he is transfigured.