A second time the rooster crowed. Then Peter called to mind the word that Jesus had said to him, “Before the rooster crows twice, you will deny Me three times.” And when he thought about it, he wept. Mark 14:72
Jesus had already said that whoever denies Him before men would be denied by Him in heaven. Peter may have thought of that as he wept. But, it is also tough to come face to face with your weakness. Peter was among those pledging their lives to defend Jesus, but they fled and he denied. But also, it is disheartening to have a prophecy of your cowardice in the face of little servant girls come to pass. How precious then becomes the forgiveness of Jesus Christ as we face our sinful weakness?
Rejoice in Christ, we have some good company in the saints,
Bucky