The record in Matthew 14:22-33 (Mark 6:45-51; John 6:15-21) is a good example of how different Gospels treat the records of Christ’s life, because all four Gospels record Jesus feeding the 5,000, so what happens after that could be similar. We must keep in mind that although there is a “total picture” of what Jesus did, each Gospel portrays that in a different way to reveal and emphasize different things. The Gospels of Matthew, Mark, and John record Jesus walking on the water, but Luke says nothing about it at all. Only Matthew records that Peter walked on the water. This no doubt helped people recognize the primacy of Peter in relation to the rest of the apostles, and also showed that Peter’s personal doubt was created by fear and taking his eyes off Jesus, a valuable lesson. By leaving the Peter event off, Mark is better able to emphasize the hardness of the disciples’ hearts and that they had not gained insight from the multiplying of the loaves, something that would have been overshadowed by the Peter incident. Thus Mark emphasizes that we are all supposed to learn from the examples of Jesus--what Jesus did and what is recorded about him is not just for us to know, but for us to learn from in our own walks. The Gospel of John does not focus on Jesus’ interaction with the apostles at all, but keeps its focus on what Jesus said and did, thus elevating him as the Son of God.
“immediately he compelled.” See commentary on Mark 6:45.