Why are you full of fear?

And they came to him, and, awaking him, said, Help, Lord; destruction is near.
Matthew 8:25

And he said to them, Why are you full of fear, O you of little faith? Then he got up and gave orders to the winds and the sea; and there was a great calm.
Matthew 8:26

And the men were full of wonder, saying, What sort of man is this, that even the winds and the sea do his orders?
Matthew 8:27