But immediately Jesus spake to them. As Christ is not known to be a Deliverer till he actually makes his appearance, he speaks, and desires his disciples to recognize him. That confidence, to which he exhorts them, is represented by him as founded on his presence; plainly implying that, since they perceive him to be present with them, there are abundant grounds of hope. But as terror had already overpowered their minds, he corrects that terror, lest it should hinder or abate their confidence: not that they could all at once lay aside fear and experience unmingled joy, but because it was necessary that the fear which had seized them should be allayed, that it might not destroy their confidence. Although to the reprobate the voice of the Son of God is deadly, and his presence appalling, yet the effect which they produce on believers is here described to us as widely different. They cause inward peace and strong confidence to hold the sway over our hearts, that we may not yield to carnal fears. But the reason why we are disturbed by unfounded and sudden alarms is, that our ingratitude and wickedness prevent us from employing as shields the innumerable gifts of God, which, if they were turned to proper account, would give us all necessary support. Now though Christ appeared at the proper time for rendering assistance, yet the storm did not immediately cease, till the disciples were more fully aroused both to desire and to expect his grace. And this deserves our attention, as conveying the instruction, that there are good reasons why the Lord frequently delays to bestow that deliverance which he has ready at hand.

It is I; be not afraid - Nothing but this voice of Christ could, in such circumstances, have given courage and comfort to his disciples: those who are grievously tossed with difficulties and temptations require a similar manifestation of his power and goodness. When he proclaims himself in the soul, all sorrow, and fear, and sin are at an end.

But straightway Jesus spake unto them,.... Directly, the very moment, as soon as ever they cried out, and he perceived the consternation they were in, as one truly affected towards them, and concerned for their welfare; he called out aloud unto them, not coming with any intention to fright them, but to save them;
saying, be of good cheer, it is I, be not afraid: take heart, be of good courage, do not be affrighted at my appearance, from whom you have nothing to fear; nor be afraid of the storm and tempest in which you are, I will deliver you; for it is I, your Master, Saviour, and Redeemer, and not any hurtful spirit; who am able to save you, and am come for that purpose. Christ may be sometimes near his people, and they not know him; as the Lord was in the place where Jacob was, and he knew it not, Genesis 28:16 and as Christ was standing by Mary Magdalene at the sepulchre, and she took him to be the gardener: and for want of a distinct knowledge of Christ in his person, offices, and grace, persons have wrong apprehensions of him, and are filled with dread and fears, concluding they have no interest in him; that he is a Saviour, but not of them; that their sins are so many, and of such a die, and attended with such aggravating circumstances, that though he is able to save them, he never can be willing to receive such vile sinners as they are: but when Christ makes himself known unto them, as the able and willing Saviour, and their Saviour and Redeemer, then, instead of dreading him as a judge, their fears vanish, their faith increases, and they are ready to do anything he shall order them; as Peter says in the next verse, who was willing to come to Christ on the water, when he knew who he was, if he was but pleased to bid him come.

It is I; be not afraid. How often has he to speak this word of encouragement, even to his own! almost always when they are brought suddenly, or in an unusual way, face to face with him. See Genesis 15:1; Genesis 21:17; Judges 6:23; Matthew 28:5; Luke 2:10.
It is I. Literally, I am. The same language used by Jesus in Jerusalem (John 8:58), for which the Pharisees would have stoned him, and in the Old Testament to designate Jehovah (Exodus 3:14). Here I should prefer to give it this meaning: Christ says not merely, "It is I, your Friend and Master;" he says, at least implies, it is the "I AM," who is coming to you, the Almighty One who rules wind and waves, who made them, and whom they obey.