According to the version in the Gospel of Matthew, Peter walked on the water towards Jesus, but he became afraid and began to sink, so Jesus rescued him.

AKA, Jesus was teaching his Disciples much more than what the public speeches and parables in the bible discuss:

(Mark 4:10-12)

And the disciples came, and said unto him, Why speakest thou unto them in parables? He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given. For whosoever hath, to him shall be given, and he shall have more abundance: but whosoever hath not, from him shall be taken away even that he hath. Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand.