When things happen all of a sudden, there is usually not much time to think about what to do next.
We will react with our instinct, and what will happen next depends on the course of action we take.
For example, when the stove catches fire, we may immediately run away to safety and let the fire die down by itself.
But that is certainly not a good course of action because it may result in the fire spreading and burn the house down.
Or we may try to put out the fire to the best of our ability in order to prevent the fire from spreading.
In the gospel, a violent storm broke over the lake without warning and the waves were breaking right over the boat that the disciples were in.
With that sudden mortal danger, they have to decide what course of action to take immediately.
And they had that sensibility to call on Jesus, and to wake Him up.
When danger suddenly appears and fear strikes, let our first course of action be to call upon the Lord Jesus for help.
May we have that little faith to believe that Jesus will help and save us.