Owen’s theology of sin seems to be far more countercultural in our current moment than it was at its original publishing. This might be untrue, technically, for human nature, bowed under the yoke of original sin, is perhaps no more fallen than it ever has been. However, in a time when the Internet and all of its cousin technologies have come to serve as primary mediators between Christians and their lived lives, participation in all kinds of sin – “of the eyes, of the flesh, and of the pride of life” – has never been so easily accessible, and that accessibility, along with the dopamine-enhanced effect of technological mediation, means that the potential addictive quality of those sins is exponentially increased (1 John 2:16). Thus Owen’s highly-attuned sensitivity toward the destructive aspects of unmortified sin is a timely and necessary word in a world spun mad by its in-turning.
However, the greatest caveat that I would attach to this book, at least for a modern reader, is the need for a closer attention to the role of the local church in the process of mortification. Perhaps this went unsaid in Owen's time, but I fear that certain Puritan emphases on the individual's life in the Spirit obscure -- intentionally or no -- the imperative role of corporate worship in the longterm sanctification of believers.
Owen rightly recognizes the work of the Holy Spirit in the individual, but apart from a robust ecclesiology, the well-meaning but otherwise untutored modern Christian might be in danger of perceiving this work to exist only through an *individualistic* relationship with the Spirit. Owen is correct to declare with fervency that it is the Holy Spirit who does the actual work of mortification, and yet the means by which the Spirit does so cannot be divorced from the place where God has promised that the Spirit is indeed at work: in the corporate worship of the local church. This is all the more important when the spirit of the current age is one of rank individualism, and one might argue that many of the ills that beset the modern church are those stemming from its attempts to cater to that individualism.
It is thus pastorally appropriate and necessary to admonish those who would mortify their sin to embrace the weekly practice of corporate, sacramental worship as a part of the Holy Spirit’s work and to warn them against fighting this good fight outside of the presence of other believers. After all, in keeping with Owen’s final pneumatological and Christological injunctions, and what better seal could there be upon the work of mortification than the comforting words one hears during Holy Communion: This is the body of Christ, broken for you. This is the blood of Christ, shed for you?