C.H. Spurgeon emphasizes the privilege and joy of preaching the gospel, as exemplified by the apostle Paul, who found humility in his calling despite his success. He illustrates that true humility comes from hard work and the recognition of one's own weaknesses, especially when proclaiming the unsearchable riches of Christ. Spurgeon encourages believers to follow Paul's example by focusing solely on Christ and His crucifixion in their ministry. He likens Christians to flowers that open to the sun, suggesting that Jesus should be the source of their strength and inspiration. Ultimately, the message of Christ is both nourishing and transformative for both the speaker and the listener.