Gregory the Great, on Job 1:7

“And the Lord said to him: Whence comest thou? And he answered and said: I have gone round about the earth, and walked through it.”

“MORAL INTERPRETATION Satan's going to and fro in the earth is his exploring the hearts of the carnal, and seeking diligently whence he may find grounds of accusation against them. He 'goeth round about the earth,' for he comes about the hearts of men, that he may carry off all that is good in them, that he may lodge evil in their minds, that he may heap up on that he has lodged, that he may perfect that he has heaped, that he may gain as his fellows in punishment those whom he has perfected in sin. And observe that he does not say that he has been flying through the earth, but that he has been walking up and down in it; for, in truth, he is never quick to leave whomsoever he tempts; but there where he finds a soft heart, he plants the foot of his wretched persuasion, so that by resting thereon, he may stamp the prints of evil practice, and by a like wickedness to his own may render reprobate all whom he is able.”

Imported from an open dataset — not yet checked against the printed edition.