Ezequiel 9
Augustine of Hippo · Comentário Patrístico (catena)
Ezequiel 9:4
But maybe that person wasn't yet a Christian. We at least, brothers and sisters, should listen; we to whom as believers the gospel is chanted, we by whom the one who said all this is worshiped, whose sign is worn by us on our foreheads and held in our hearts. It makes a great deal of difference, you see, where a person keeps the sign of Christ, whether on the forehead or both on the forehead and in the heart. You heard, when the holy prophet Ezekiel was speaking, how before God sent an exterminator of a wicked people, he first sent a marker and said to him, "Go and mark with a sign the foreheads of those who groan and grieve over the sins of my people, which are committed among them." Yet for all that they groan and grieve; and this is why they have been marked with a sign on the forehead—the forehead of the inner self, not the outer one. There is a forehead of the face, you see, and a forehead of the conscience. In fact, sometimes the inner forehead gets a knock, and the outer one blushes; it either blushes for shame or turns pale with fright. — SERMON 107:7
Ezequiel 9:6
So there is a forehead of the inner self. That is where those people were marked, to save them from being wiped out. Because even if they did not put right the sins that were committed among them, at least they were pained by them, and by their very pain they set themselves apart; while set apart for God, they were mixed together in the eyes of people. They are marked with a sign in secret; they escape harm in public. The destroyer is sent next and is told, "Go, destroy, do not spare young, old, male, female; but do not go near those who have the sign on their foreheads." What a sure guarantee has been given you, my brothers and sisters, you among this people who are groaning and grieving over the wicked deeds committed in your midst and are not committing them! — SERMON 107:7