The miracles Jesus’ performs in the gospels are never raw feats of strength to prove His divinity. If we read the gospels closely, the works always reveal who God is, and often who we are in Him. This is not to say that the physical effects are not important. When Jesus made good wine toward the end of the wedding feast of Cana, it had to be good wine to communicate accurately about the new covenant. If Jesus is Lord of land and sea, the God who redeems and leads His people out, He better be able to walk on water.  This episode in the boat is two parts, each with six verses concluding with a statement about who Christ is, first by Jesus and then by Peter.