John Calvin Commentary Matthew 14:27

"But straightway Jesus spake unto them, saying Be of good cheer; it is I; be not afraid." — Matthew 14:27 (ASV)

But immediately Jesus spoke to them. As Christ is not known to be a Deliverer until he actually makes his appearance, he speaks and desires his disciples to recognize him. That confidence, which he urges them to have, is presented by him as founded on his presence; plainly implying that since they perceive him to be present with them, there are abundant grounds for hope.

But as terror had already overpowered their minds, he corrects that terror, lest it should hinder or lessen their confidence. It was not that they could all at once lay aside fear and experience unmingled joy, but because it was necessary that the fear that had seized them should be calmed, so that it might not destroy their confidence.

Although to the reprobate the voice of the Son of God is deadly and his presence appalling, the effect these produce on believers is described here as widely different. They cause inward peace and strong confidence to prevail in our hearts, so that we may not yield to carnal fears.

But the reason we are disturbed by unfounded and sudden alarms is that our ingratitude and wickedness prevent us from using as shields the innumerable gifts of God, which, if they were used properly, would provide us with all necessary support.

Now although Christ appeared at the proper time to offer assistance, the storm did not immediately cease until the disciples were more fully aroused both to desire and to expect his grace. And this deserves our attention, as it teaches us that there are good reasons why the Lord frequently delays to grant the deliverance he has ready at hand.