How Do I Kill Remaining Sin? by Geoffrey Thomas is part of the 12-booklet Cultivating Biblical Godliness series published by Reformation Heritage Books. This booklet is very short at just 30 pages and looks at the word 'mortify' from Romans 8:13. Mr. Thomas states that "[w]e all need to understand this subject of mortification and to put ourselves under the sanctifying power of God's truth to help us become more mature Christians," (p. 2). His goal is to "consider some biblical propositions that lay a foundation for practical ways of putting to death indwelling sin," (p. 2).
First, Mr. Thomas makes the biblical case that the true believer is dead to the dominion of sin in his life. Even though a Christian is a new creature, Scripture shows that he still struggles with the flesh or remaining sin in his life. The author then looks at three specific areas of sin that the Christian may struggle with: drunkenness, adultery, and pornography.
Mr. Thomas expounds not only the mortification of sin, but also its counterpart of vivification, or bringing to life the new man. This book is a solid primer for mortifying sin in a Christian's life. I recommend it for all Christians, but especially those who are new to the Christian faith. For a more thorough look at mortifying sin, I recommend John Owen's Mortification of Sin.
"Therefore, brethren, we are debtors, not to the flesh, to live after the flesh. For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live. For as many as are led by the Spirit of God, they are the sons of God," (Romans 8:12-14).