Men and brethren. — Better, brethren only, the word being used as in the LXX. of Genesis 13:8. The tone of St. Peter’s speech is that of one who felt that his offence had been fully forgiven, and that he was now restored by the charge given him, as in John 21:15-17, to his former position as guide and leader of the other disciples. To do that work faithfully was a worthier fruit of repentance than any public confession of his guilt would have been. This, of course, does not exclude — what is in itself probable — that he had previously confessed his fault, either to his special friend St. John, or to the whole company of Apostles and other disciples.
Which the Holy Ghost by the mouth of David spake... — We have here, obviously, the firstfruits of the new method of interpretation in which the Apostles had been instructed (Luke 24:27; Luke 24:45). They had already been taught that the Holy Spirit which their Lord had promised to them had before spoken by the prophets. The recurrence of the same mode of speech in the “holy men of God who spake as they were moved (literally, borne along) by the Holy Ghost,” in 2 Peter 1:21, is, as far as it goes, evidence in favour of the genuineness of that Epistle.
Which was guide to them that took Jesus. — The actual word “guide” is not found in the Gospel narrative, but it appears as a fact in all four, notably in that of St. John (John 18:2-3).