William Burkitt on Matthew 14:31

Observe here, 1. The mercy of Christ is no sooner sought, but found: immediately Jesus put forth his hand and caught him. O with what speed, and with what assurance, should we flee to that sovereign bounty, from whence never any suitor was sent away empty.

Observe, 2. Though Christ gave Peter his hand, yet with this hand he gave him a check; O thou of little faith, wherefore didst thou doubt? Though Christ likes believing, yet he dislikes doubting. A person may be truly believing, who nevertheless is sometimes doubting, but his doubting eclipses the beauty of his believing.