Jesus doesn't doubt Peter. Jesus doesn't scold Peter. Peter doesn't doubt Jesus. Peter doubted himself. And not in a healthy way. He doubted that he could walk in the footsteps of Jesus, his Rabbi, his teacher, his friend. When we doubt that we have learned everything and use that doubt to continue to learn we are healthily using our doubt to better our lives. When we doubt that we can walk in Jesus footsteps, then we are venturing down the path of death and not living in the grace of eternal salvation and bringing about the realization of heaven on earth. Don't doubt that you have faith. Doubt that you are doing enough in your faith and strive to do more with the faith that God has in you.

Matthew 14:23-32