15 Now when Jesus saw that the people were about to come and take him by force to make him a king, he went away again up the mountain by himself.
16 When evening came the disciples went down to the sea; 17 And they took a boat and went across the sea in the direction of Capernaum. By then it was dark and still Jesus had not come to them. 18 The sea was getting rough because of a strong wind which was blowing. 19 After they had gone three or four miles they saw Jesus walking on the sea and coming near to the boat; and they had great fear. 20 But he said to them, It is I, have no fear. 21 Then they readily took him into the boat: and straight away the boat was at the land to which they were going.
Matthew Henry's Commentary on John 6:15-21
Commentary on John 6:15-21
(Read John 6:15-21)
Here were Christ's disciples in the way of duty, and Christ was praying for them; yet they were in distress. There may be perils and afflictions of this present time, where there is an interest in Christ. Clouds and darkness often surround the children of the light and of the day. They see Jesus walking on the sea. Even the approaches of comfort and deliverance often are so mistaken, as to become the occasions of fear. Nothing is more powerful to convince sinners than that word, "I am Jesus whom thou persecutest;" nothing more powerful to comfort saints than this, "I am Jesus whom thou lovest." If we have received Christ Jesus the Lord, though the night be dark, and the wind high, yet we may comfort ourselves, we shall be at the shore before long.