Jesus Walking On Water - Wherefore Didst Thou Doubt?

There are several keys to this video.  Peter calls, "Bid me come onto thee on the water."  First Peter does walk on the water, but loses his faith with he notices the elements.

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Then Peter cries out, "Lord, Save Me."  Won't the Lord always save us when we reach out to him,  I wonder if this is what Jesus referred to when he said, "Wherefore Didst Thou Doubt."  Peter then proclaims Jesus as the Son of God.