And the second time the cock crowed. And Peter called to mind the word that Jesus said unto him,
Before the cock crows twice, you shall deny me three times.
And when he thought on this, he wept.
All Commentaries on Mark 14:72 Go To Mark 14
Gregory The Dialogist
AD 604
And here we must ask ourselves, why did almighty God permit the one he had placed over the whole church to be frightened by the voice of a maidservant, and even to deny Christ himself? This we know was a great dispensation of the divine mercy, so that he who was to be the shepherd of the church might learn through his own fall to have compassion on others. God therefore first shows him to himself, and then places him over others: to learn through his own weakness how to bear mercifully with the weakness of others.