And Peter answered him, "Lord, if it is you, bid me come to you on the water." He said, "Come." So Peter got out of the boat and walked on the water and came to Jesus; but when he saw the wind, he was afraid, and beginning to sink he cried out, "Lord, save me." Jesus immediately reached out his hand and caught him, saying to him, "O man of little faith, why did you doubt?" 

Matthew 14:28-31

"The Hand of the Lord threatens to strike. His angry look says to the earth to be on guard. His promise consoles and strengthens the just and crushes the sinners (the unrepentant) like a speck of dust."

- St. Cassian of Imola