John Owen's Mortification of Sin is a concise yet searching work of seventeenth-century Puritan theology, expounding Romans 8:13 with rigorous pastoral urgency: "be killing sin, or it will be killing you." Its prose is dense, aphoristic, and scripturally saturated, combining scholastic precision with devotional force. Set within Reformed practical divinity, the book analyzes indwelling sin, false remedies, and the Spirit-dependent discipline by which believers resist corruption. Owen, one of the foremost English Puritan theologians, was a pastor, controversialist, and sometime vice-chancellor of Oxford during the Commonwealth. His experience amid political upheaval, ecclesiastical conflict, and pastoral care shaped his insistence that Christian holiness is neither moralism nor self-help, but participation in the sanctifying work of the Holy Spirit. His formidable learning serves a deeply experiential concern: the health of the soul before God. This book is recommended to readers seeking a serious, unsentimental account of spiritual transformation. Though its language demands patience, its insight remains bracingly contemporary, especially for those weary of superficial treatments of temptation, conscience, and grace.

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John Owen (1616-1683) was an English Nonconformist church leader, theologian, and academic administrator at the University of Oxford. Owen was a spirited defender monergism, emphasizing the sovereignty of God and the authority of the Bible. He believed in individual and distinct worship of each of the persons of the Trinity. Besides his academic and literary concerns, Owen was continually involved in affairs of state.