John Wilson (1588–1667) was a passionate and intense Reformed minister of the Gospel who was praised by men such as William Ames, Thomas Goodwin, and Jeremiah Burroughs. Wilson explains John 4:24 in detail concerning Christ's simply instituted worship: in spirit and truth. He shows, with all the power and effect of a biblical sledgehammer, that anything outside of what Christ has instituted should be considered idolatry, and should be cast out of the church. Wilson covers what worship is, what it means to worship God in both spirit and truth, and how this is the Christian’s duty to do so. He gives various cautions against worshiping God as an idolater, the application of worshipping in spirit and truth, and dispels obstacles that often hinder Christians in godly and holy worship. This work is not a scan or facsimile, has been carefully transcribed by hand being made easy to read in modern English, and has an active table of contents for electronic versions.