But when he (Peter) saw the wind boisterous, he was afraid; and beginning to sink, he cried, saying, Lord, save me. And immediately Jesus stretched forth his hand, and caught him, and said unto him, O thou of little faith, wherefore didst thou doubt?

"I believe that this representation of Jesus reaching out to a doubting Peter, also symbolizes Jesus reaching out to all who are sinking in a sea of sin."
-Doug