The sea was more than an unfriendly place in the ancient world, as it was believed to be the gate to the underworld. It was dark, mysterious, and downright terrifying. To be in a boat, during a storm would have been more terrifying as the likelihood of you getting thrown into the sea seemed almost certain.
As terrified as the disciples were, Jesus, it seems was sound asleep. The disciples begin to plead for help, and he speaks, the sea stops. What kind of man is this that the underworld responds to his orders? In one word he silences the sea, then he speaks to them about their faith. Why do they still lack it? Is Jesus speaking of faith in him, faith in themselves, or faith in th world in which they lived? Maybe it was all three.