What does Luke 8:25 mean?
With a simple rebuke, Jesus stilled a fierce storm on the Sea of Galilee. He now turns to the disciples who had reacted out of fear and asks them about their faith. Mark's account has, "Why are you so afraid? Have you still no faith?" (Mark 4:40). Matthew puts the question prior to Jesus rebuking the storm: "Why are you afraid, O you of little faith?" (Matthew 8:26).This question ties to the recently-recorded parable of the sower (Luke 8:4–8). What kind of faith do the disciples have? In this moment, it appears to be that of the soil with thorns. They believe until they are beset by the "cares…of life" (Luke 8:14). Jesus exhorts them to have the faith of the good soil that takes in what Jesus says and does and allows what they learn to change their hearts. Instead, they react in fear as if Jesus' power is unknown to them.
Luke 8 gives a series of parables and practical examples of different types of faith under different circumstances. The disciples have seen Jesus heal sickness and injuries and expel demons, but control over the sea is on another level. The sea represents chaos and all that mankind cannot control. Only God can take formless water and bring it to order (Genesis 1:1–10). Such control over water has not been seen since the parting of the Red Sea or, to a lesser extent, the parting of the Jordan (Exodus 14; Joshua 3:14–17). Jesus didn't even pray and ask for God's power.
It's reasonable for the disciples to respond to this level of power by rethinking who Jesus truly is. As their understanding of Jesus grows, their faith must, also. Although their fear shows a lack of faith, their question is encouraging. Like the fertile soil, they are contemplating and asking questions, not merely walking away. Before long, Peter will be able to name their Teacher: "The Christ of God" (Luke 9:20).
But naming Jesus as the Messiah only goes so far. Only God can control the sea with a mere word.