Gregory the Great — as excerpted in the Catena Aurea on Luke 16:27-31

“Sometimes also in the holy Word by dogs are understood preachers; according to that, That the tongue of thy dogs may be red by the very blood of thy enemies; (Ps. 68:23. Vulg.) for the tongue of dogs while it licks the wound heals it; for holy teachers, when they instruct us in confession of sin, touch as it were by the tongue the soul’s wound. The rich man was buried in hell, but Lazarus was carried by angels into Abraham’s bosom, that is, into that secret rest of which the truth says, Many shall come from the east and the west, and shall lie down with Abraham, Isaac, and Jacob in the kingdom of heaven, but the children of the kingdom shall be cast into outer darkness. But being afar off, the rich man lifted up his eyes to behold Lazarus, because the unbelievers while they suffer the sentence of their condemnation, lying in the deep, fix their eyes upon certain of the faithful, abiding before the day of the last Judgment in rest above them, whose bliss afterwards they would in no wise contemplate. But that which they behold is afar off, for thither they cannot attain by their merits. But he is described to burn chiefly in his tongue, because the unbelieving people held in their mouth the word of the Law, which in their deeds they despised to keep. In that part then a man will have most burning wherein he most of all shews he knew that which he refused to do. Now Abraham calls him his son, whom at the same time he delivers not from torments; because the fathers of this unbelieving people, observing that many have gone aside from their faith, are not moved with any compassion to rescue them from torments, whom nevertheless they recognise as sons.”