Matthew 14:28 Meaning

26And when the disciples saw him walking on the sea, they were troubled, saying, It is a spirit; and they cried out for fear.

27But straightway Jesus spake unto them, saying, Be of good cheer; it is I; be not afraid.

28And Peter answered him and said, Lord, if it be thou, bid me come unto thee on the water.

29And he said, Come. And when Peter was come down out of the ship, he walked on the water, to go to Jesus.

30But when he saw the wind boisterous, he was afraid; and beginning to sink, he cried, saying, Lord, save me.