F.B. Meyer emphasizes the necessity of preaching the cross with the power of the Holy Spirit rather than relying solely on human effort and intellect. He shares a personal experience of employing discharged prisoners in his wood factory, illustrating how their lack of efficiency compared to a gas-engine highlights the importance of divine power in ministry. Meyer urges ministers to connect with the Holy Spirit, suggesting that the miracles of Pentecost can be repeated today if they tap into God's strength. He reassures that the promise of the Holy Spirit is not limited to the past but is available to all believers who are called by God. Ultimately, he calls for a revival of spiritual power in the church.