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Licensed to Kill: A Field Manual for Mortifying Sin is unavailable, but you can change that!

The Christian life is not a playground, but a battleground. One of the fiercest foes in this battle dwells within our own hearts: the enemy of indwelling sin. The Scriptures command us to “put sin to death.” This is what pastors and theologians of another generation called the “mortification” of sin. But how do we mortify sin? And what role does the gospel play in this effort to apply lethal...

If we want to kill sin, we must aim at the right target. That target is not merely bad behavior but the sinful desires of the heart that produce the behavior. Mortifying sin will certainly bring about changes in what we say and do, but we need more than external reformation. Many people change their behavior without changing their heart to any significant degree. But Jesus is concerned about the root and motivation of sinful behavior—our drives and desires—not simply the behavior itself. For example,