What does the Bible say about having faith in God?

In Matthew 14:30-31, the account of Peter walking on water illustrates both the nature of faith and the consequences of doubt. When Peter focused on Jesus, he was able to defy the natural laws of physics and walk on water. However, when he looked at the boisterous waves and became afraid, he began to sink, leading him to cry out to Jesus for salvation. This teaches us that maintaining our focus on Christ is crucial to exercising and sustaining our faith. Jesus' immediate response to Peter's cry, 'O thou of little faith, wherefore didst thou doubt?' reflects our struggles with doubt and the importance of trusting in God's promises.