Jesus' walking on the water

For us Chinese, we have a wealth of legends in which the miracles are far more spectacular than those recorded in the Bible. It is not easy for us to appreciate their significance unless we study the Bible thorough enough to gain a certain level of background understanding. Walking on the water seems ordinary enough. Even heroes in martial art novels are able to perform such fits. So, what is the significance of Jesus' walking on the water?
All canonical gospels except Luke tell this walking on the water story. This happened after Jesus had fed 5000 with 5 loaves and 2 fish. It took place at night. The disciples were rowing a boat across the sea while Jesus was praying alone somewhere on the land. They were struggling with the waves.
In Mark, the disciples were shown in a bad light. They had witnessed many miracles of Jesus up close, yet their hearts were hardened.

for they did not understand about the loaves, but their hearts were hardened (Mark 6:52).
In Matthew, we have an extra episode of Peter walking on the water to Jesus. He lost faith and sank. Immediately, Jesus reached out his hand and rescued him. Peter would have performed the same miracle as Jesus did had he kept his faith. Yet he failed.
And those in the boat worshiped him, saying, "Truly you are the Son of God." (Matthew 15:33)
In John, the mood is totally different. John did not cast the disciples in such a bad light. Yes, like the other 2 gospels, the disciples were frightened to see Jesus walking on the water. This fear is interpreted as a fear in the presence of the divine. (In Mark, the disciples were frightened because they thought they were seeing a ghost!) Yet, Jesus did not blame them. He simply said "It is I Ἐγώ εἰμι; do not be afraid μὴ φοβεῖσθε." (John 6:20), confirming their feeling that they were meeting God. The story ends in a cheerful mood.
Then they were glad to take him into the boat, and immediately the boat was at the land to which they were going (John 6:21).
In the gospel of John, the statement Jesus made, Ἐγώ εἰμι I AM , is a label referring to his divinity. It reminded the Jews the scene of the burning bush in which God revealed His name to Moses: I AM WHO I AM ᾽Εγώ εἰμι ὁ ὤν· (Exodus 3:14 LXX). Therefore, this episode is a theophany, God appearing to man. The scene calls up many OT images. For example, in Genesis, there were darkness and chaos and God was hovering upon the water. In Exodus, God accompanied the Israelites to cross the Reed Sea into safety and freedom. We need more background understanding of the bible in order to appreciate the significance of this and similar miracles.

My sweet Jesus, I adore You. You are my God and my Lord. Walking with You, we are not afraid of any turmoil. Our school is in deep trouble. Come to our aid and see us through. Amen.