Horatius Bonar emphasizes the contrast between the helplessness of Peter and the unwavering support of Jesus during a stormy night on the sea. The sermon illustrates how faith is often tested by fear and doubt, as seen when Peter begins to sink after initially walking on water towards Jesus. Bonar highlights the importance of recognizing Jesus' presence and power, which brings comfort and courage amidst life's storms. Ultimately, the message conveys that even in moments of weakness, Jesus is ready to save and support those who call upon Him.