D.L. Moody emphasizes the urgent need for church members to actively speak for Christ and reach out to those on the path to ruin. He argues that the church does not require new methods or structures, but rather the revival of the old power that the Apostles possessed, which can invigorate both ministers and congregants. Moody highlights that being filled with the Spirit is essential for effectively wielding the 'sword of the Spirit,' which is the Word of God, and that without this empowerment, the church struggles to overcome spiritual challenges. He calls for a transformation in the hearts of believers, urging them to seek the Spirit's guidance and strength to fulfill their mission.