'The Gospel Mystery of Sanctification' by Walter Marshall, first published in 1692, is one of the classic works of Christian spirituality. It is a deep and rich biblical study of sanctification - how Christians grow in holiness and become more like Jesus. In a day when Christians are very prone to pursue self-help methods to grow in obedience to Christ, Walter Marshall lays out the biblical way of growth: obedience comes as Christians live by grace, in union with Christ, by faith. Growth comes, as Paul says in Galatians 2:20, through ""Christ living in me."" The message of this book is so important for Christians today, it is essential that it be rewritten in contemporary English. ""How can we command holiness without causing despair among saints who know that they are still sinners? Walter Marshall's answer to this 'mystery' not only saved lives in his time, but continues to bring renewed zeal for God to believers in the generations since. The relief and resolve of grace are the Gospel mystery that elude so many but find rejuvenating expression in the firm grasp of Marshall."" Dr. Bryan Chapell, President, Covenant Theological Seminary ""In this extremely insightful book, Marshall reminds us that our union with Christ by faith is the wellspring of the transforming power of the gospel. Following in the steps of the Reformers, he explains the biblical view of true faith in sanctification - a faith in Christ manifested through a proper use of the means of grace (such as prayer, the word, sacraments, and the church). Marshall's discussion is balanced - he avoids the common extremes that lead to errors frequently found in works on this subject."" Dr. Steven L. Childers, Associate Professor of Practical Theology, Reformed Theological Seminary, Orlando, Florida ""As Marshall states at the beginning of the book, there is no argument that we should obey God's law. The question is - how do we actually do it? In great detail Marshall explains how faith and the gospel are actually the means to accomplish what is required for the Christian life. This is a book that takes its place alongside key books like 'The Marrow of Modern Divinity' in defining the nature of the Christian life. It is part of the Reformed church always reforming itself, and as such it deserves to be kept before the Christian public."" Rev. Steve Smallman, Pastor, New Life Presbyterian Church, Philadelphia, Pennsylvania Dr. Bruce H. McRae is an ordained minister in the Presbyterian Church in Ame