The biggest obstacle to Peter's ministry was not Rome, nor the Pharisees, but his own conscience. He had failed publicly. The "gap" between the resurrection and Pentecost was the time for Jesus to treat this wound.
The Scenario
After the cross, Peter goes back to fishing. He gives up on apostleship. The phrase "I am going fishing" (John 21:3) sounds like "I am going back to my old life; I failed at the new one." He was paralyzed by shame.
The Investigation
Jesus appears on the beach not to condemn, but to reconnect.
- The Charcoal Fire: Jesus makes a charcoal fire (John 21:9). The last time Peter saw a fire, he was denying Christ. Jesus recreates the scene of the trauma to heal the trauma.
- The Question: Three denials required three affirmations of love. Jesus didn't ask "will you obey me?", but "do you love me?". Love heals what discipline cannot.
The Conclusion
Before filling Peter with the Spirit (power), Jesus filled Peter with Grace (acceptance). No one can preach forgiveness if they don't feel forgiven. The Peter of Acts 2 is powerful because the Peter of John 21 was forgiven. If you think your mistake canceled your calling, remember: the calling is irrevocable, but the conscience needs to be washed.