Jonathan Edwards's Treatise on the Religious Affections - language updated to a more modern English. "In the Preface to A Treatise on the Religious Affections, Jonathan Edwards argues that determining the true nature of saving faith is the single most vital question facing humanity, yet it remains deeply obscured by widespread debate and counterfeit experiences. Reflecting on past spiritual awakenings—from biblical revivals to the Protestant Reformation and New England's Great Awakening—Edwards explains how Satan consistently undermines divine revivals not through open persecution, but by mixing false, unexamined emotionalism with true holiness. Unmasking these counterfeits is essential, as mistaking false zeal for genuine grace leads to spiritual self-deception, bitter division among Christians, and the eventual decay of genuine revivals. Edwards writes this treatise to provide clear, biblical criteria for distinguishing the saving operations of the Holy Spirit from non-saving spiritual counterfeits, urging believers to pursue lasting spiritual clarity.