Instantly Jesus reached out his hand and caught and held him, saying to him, O you of little faith, why did you doubt? (Matthew 14:22-33 Amp)
After Jesus fed more than five thousand people with five loaves and two fish, he left the crowd and his disciples and went away to pray. He must have prayed for a long time as it is some time between three o'clock and six o' clock in the morning that he comes walking on the sea to his disciples.
The disciples who are in a boat see this figure walking on the water and they scream out in fear; they think it is a ghost. But Jesus quickly identifies himself and tells them not to be afraid.
Then Peter asked Jesus to invite him to walk on the water. The other disciples were satisfied with knowing that it was Jesus and that they were safe. Peter was safe too, but he wanted more. He wanted to do exploits and Jesus did not discourage, or criticize him. And although God is completely in charge of our lives and his Holy Spirit endows us with gifts, I believe sometimes we might need to ask God to do the impossible. Only we have to be careful not to look at ourselves, or the circumstances, or we will go under one way or the other - through pride or doubt.
Jesus is standing on the water. He tells Peter to come to him and Peter steps out of the boat and begins to walk on the water towards Jesus. Everything is fine until he turns away from looking at Jesus. Then he becomes frightened of the expanse of the universe around him. And I guess, of his smallness and vulnerability against the vast ocean and the mighty winds.
Just for one moment he forgot that one who was deeper than the ocean and greater than the winds was with him. He became frightened and doubted. At that very moment he began to sink (under the weight of the circumstances/ what he saw). The water would have drowned him, but it didn't because he became desperate and called out to Jesus.
Jesus said to him, 'O you of little faith, why did you doubt (Matt. 14:31)? Little faith equals doubt. Doubt destroys every premise of Christianity, every fabric of our faith, our Christian life and walk. Doubt overshadows the power and character of the God whom we serve and our victory in Him.