The sermon discusses the importance of childlike faith in deepening one's relationship with God. It highlights the notion that as adults, we often lose the simplicity and trust we had as children, which is essential for entering the kingdom of heaven, as described by Jesus. The sermon reflects on the disciples' challenges in trusting God fully, even when witnessing miracles, and draws on personal stories that resonate with spiritual struggles. It emphasizes that, despite being saved, Christians are continuously refined by God and must maintain a childlike faith throughout their spiritual journey. The sermon provides practical advice on integrating this faith into everyday life and encourages listeners to trust in God's plan and love.