Peter had to think with the mind of Christ and live in the reality of what just happened. Jesus rose from the dead and now His calling on Peter's life was becoming real. Jesus called the disciples and you to be "fishers of men", and Peter was struggling with the whole process. Learing to live in "What is" and not "What if" is a key teaching of Jesus; living your life and not trying to live someone else's life is called staying in reality. Let's learn to live in "What is".