Then they willingly received him into the ship: and immediately the ship was at the land to which they went.
All Commentaries on John 6:21 Go To John 6
John Chrysostom
AD 407
He not only gave them a safe passage, but also one with a fair wind.
To the multitude He shows not Himself walking upon the sea, for the miracle was too great to suit their infirmity. Indeed, even by the disciples He was not seen long doing this, but He appeared, and at once retired. Now this seems to me to be a different miracle from that found in Matthew xiv .; and that it is different is clear from many reasons. For He works often the same miracles, in order to cause the beholders not merely to count them very strange, but also to receive them with great faith.
It is I, be not afraid. As He spoke the word, He cast out fear from their souls. But at another time not so; wherefore Peter said, Lord, if it be Thou, bid me to come unto You. Matthew 14:28 Whence then was it that at that time they did not straightway admit this, but now were persuaded? It was because then the storm continued to toss the bark, but now at His voice the calm had come. Or if the reason be not this, it is that other which I have before mentioned, that oftentimes working the same miracles, He made the second to be readily received by means of the first. But wherefore went He not up into the ship? Because He would make the marvel greater, would more openly reveal to them His Godhead, and would show them, that when He before gave thanks, He did not so as needing aid, but in condescension to them. He allowed the storm to arise, that they might ever seek Him; He stilled the storm, that He might make known to them His power; He went not up into the ship, that He might make the marvel greater.