If John Owen’s The Mortification of Sin is a bit heavy for you, Licensed to Kill: A Field Manual for Mortifying Sin by Brian Hedges might be a good place for you to start. Here is an early excerpt:
Putting to death sin is the duty of every Christian, but no one can become a Christian by mortification. The only sins we can kill are the sins that have been forgiven by the shed blood of Jesus. Owen said, “There is no death of sin without the death of Christ.” To attempt to kill sin without Christ will only delude us and harden us further in our sins. The first priority in dealing with sin is to look to the crucified Savior, Jesus Christ.
In one of the most interesting stories in the Old Testament, the newly rescued people of Israel sinned by murmuring against God and his servant Moses. Their unprovoked sin was so evil that the Lord judged them by sending poisonous snakes into their camp. These “fiery serpents . . . bit the people, so many people of Israel died.” Then the people came to Moses, confessed their sin, and begged him to ask God to take the snakes away. Moses prayed for the people, and God gave him a strange command: he was to make a serpent from bronze and place it on a pole in the middle of the camp. Then, if someone had been bitten by a snake, he or she had only to look at the bronze snake in order to be healed. The simple act of gazing at the brazen serpent brought life and healing (see Numbers 21:4–9).
But more amazing is how Jesus used this story on the New Testament: :And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up, that whoever believes in him might have eternal life” (John 3:14–15).
The most important thing to understand in this first chapter is this: before you can kill sin, you have to look to the Lord who was lifted up on the cross for you. You cannot fight sin unless you have found rest in the inexhaustible sufficiency of the doing and dying of Jesus Christ in your place. You cannot mortify sin unless that sin has already been nailed to the cross of Christ. There is no death of sin without the death of Christ.
—Brian G. Hedges, Licensed to Kill: A Field Manual for Mortifying Sin (Cruciform Press, 2011), 16–18.
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