Many stumbled, however, when Jesus made claims which required their allegiance and surrender to him as the one with final authority. Jesus claimed to be the very life of God come down from heaven and that no one could live this life without submitting to him. This expression meant that it was not just hard to understand, but hard to accept. Jesus pressed the issue with his beloved disciples because he wanted to test their faith and loyalty. Jesus knew that some would not only reject him and his word, but would do so hostily, even betraying him to his enemies.
Real faith seeks understanding.
Jesus offers his life-giving word and Spirit to those who believe and who submit to his authority. Peter s profession of loyalty was based on a personal relationship with Jesus. Peter knew that Jesus was the Messiah, the Holy One of God, and he believed in his words. Faith is a response to God's revelation. It's the key to seeing God work in our lives with power.