The maid saw [Peter], and began again to tell those who stood by, “This is one of them.” But he again denied it. After a little while again those who stood by said to Peter, “You truly are one of them, for you are a Galilean, and your speech shows it.” But he began to curse, and to swear, “I don’t know this man of whom you speak!” The rooster crowed the second time. Peter remembered the word, how that Jesus said to him, “Before the rooster crows twice, you will deny me three times.” When he thought about that, he wept.
Mark 14:69-72 (WEB)
What sorrow Peter must have felt. How disgusted with himself, how desperate he must have grown over the days between Jesus’ arrest and the resurrection. But look what God did with his life! And if God can do that for him, what can He do for you and me? What can He make of this broken mess?