You probably remember the story in the Bible where St. Peter tried walking on water, as soon as things got turbulent he began to sink and Jesus saved him and pointed out he lacked faith. Peter went on to be the first Pope a Martyr and a Saint.
Could you imagine if St. Peter was given a "do over" towards the end of his life? I bet he would have danced on the water. His faith must have grown so much during his life. After all that is how it works. As we go through life we are given many situations where we can choose to depend on God. Each time we grow in faith. I can only imagine the trial and tribulations of being the first Pope. I think his faith grew way beyond what was needed to walk on water. I try to keep this in mind when I am feeling the growing pains of Faith. If God is testing your faith, keep St. Peter in mind, God has a bigger plan for you, He just needs to get you in to shape!