Why did Peter had a little faith in the midst of his doubts? Here in this passage, you could see that his sight was a hindrance. Before he ‘saw the wind’, the sea and waves did not bother him. Peter set out because he was focused to the pathway of light that came gleaming across the darkness from where Christ stood. When he took his eyes of Jesus, he ‘saw the wind’ and he began to sink.
When the Lord shall call to you over the waters, “Come,” step gladly forth. Look not for a moment away from Him. Not by measuring the waves can you prevail; not by gauging the wind will you grow strong; to scan the danger may be to fall before it; to pause at the difficulties, is to have them break above your head.
Lift up your eyes unto the hills, and go forward - there is no other way.