This sermon, rooted in Deuteronomy 12:31 and the Westminster Confession of Faith, emphasizes that true worship is divinely regulated, not shaped by human tradition or imagination, and must conform strictly to Scripture. It unfolds the Puritan principle of the regulative nature of worship—where every element, from prayer and Scripture reading to preaching and sacraments, is grounded in biblical command and designed to sanctify the believer. The preacher underscores that worship is not merely ritual but a transformative means of grace, intended to humble pride, mortify sin, deepen love for Christ, and edify the church through the Word, prayer, and sacraments. Drawing from the Public Directory of Worship, the sermon calls for reverent, focused participation—free from distraction, worldly recreation, or irreverent behavior—while highlighting the necessity of faithful, clear, and application-driven preaching that challenges the heart and calls for repentance. Ultimately, worship is presented as a holy, ordered practice that glorifies God and sanctifies His people, reflecting the enduring conviction that God is to be honored in spirit and truth, according to His revealed will.