“But when he saw the wind boisterous, he was afraid; and beginning to sink, he cried, saying, Lord, save me.”
King James Version (KJV)
14:30 He was afraid - Though he had been used to the sea, and was a skilful swimmer. But so it frequently is. When grace begins to act, the natural courage and strength are withdrawn.
Mt 14:30 When he saw the wind boisterous, he was afraid. He stepped into the water, but the roaring winds and rushing billows were too much for his faith.