During the trial of Jesus, Peter denied knowing him three times.  Not once, not twice, but three times.  Do you know what it is like to struggle over the same sin time and time again?  Peter knew what it meant to fail the one he loved the most and consequently, knew the guilt and shame that came with that decision.  Despite his failure, God restores Peter to his calling. This is a powerful message on what you need to know when you have made a
mistake.