Matthew 14:31

Immediately. There is no delay on God’s part to respond to the sincere prayer for deliverance from the waves of temptation that ever and anon sweep over the soul.

Thou of little faith. In love Jesus first saved Peter, and then rebuked his lack of trust. He did not censure Peter for essaying to walk on the water, but for letting go of faith. In part, Peter understood and appreciated the lesson Jesus designed he should learn from this experience, but had he learned it fully he would not, a year later, have failed when the great test confronted him (ch. 26:69-75; cf. DA 382).

Doubt. Gr. distazo, “to hesitate,” “to be in doubt,” or “to waver.” A person hesitates when he is in doubt as to which of two directions, or courses of action, he should take. “No man can serve two masters” (see on ch. 6:24) or feel comfortable even attempting to do so.