Peter failed miserably when it came time to maintain his confession of Jesus Christ. A little social pressure in the courtyard of the high priest, and Peter opted to save his own skin by denying any knowledge of Jesus. In his failure, though, all disciples of Jesus can learn a powerful lesson about "godly sorrow," and the grace of guilt leading to repentance. There is always hope in Jesus Christ.
It is ironic that Judas betrayed Jesus with a friend's kiss. It is more ironic that Judas' love of money served God's purposes for the redemption of the world. Still, reflection on the case of Judas reminds us of the need to love God and the things that God loves.
Jesus models for Peter, James, John--and for us--that the willing spirit is able to overcome the gravity of the flesh through faithfulness in prayer.