John Gill Bible Commentary

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, Gen 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.