Rom 6:6 says, “Knowing this, that our old man is crucified with him…”. One of the best ways to deal with those sins that keep coming up is to remember this. Our old man is crucified with Jesus.
When you were saved, you became a new creature in Christ, old things are passed away and all things are become new, 2 Cor 5:17. According to Eph 4:22-24, therefore, we have an old man and a new man. And we must put off the old man. That’s a bit easier to do when we reckon that our old man is crucified with Christ, Gal 2:20.
One purpose of the old man being crucified with Christ is “that the body of sin might be destroyed”, Rom 6:6. We were born with a body that will die because of sin. This body must be destroyed. When Jesus was born, he had flesh that could die, and did die when he bore our sins in his own body, 1 Pet 2:24. But he arose with a body that cannot die. Rom 6:9 says, “death hath no more dominion over him”. Likewise, we will receive a glorified body that cannot die, Phil 3:20. And death will not have dominion over us, either, Rev 21:4.
Another purpose of the old man being crucified with Christ is “that henceforth we should not serve sin”, Rom 6:6. God does not want sin to reign in our mortal body, so he crucified us with Christ. Rom 6:7 says, “For he that is dead is freed from sin”. Therefore, when confronted with sin in our flesh, in which is nothing good, Rom 7:18, we can simply reckon that we are dead, Rom 6:11.
Picture your old man as crucified, with nails in your hands and feet and with your side pierced. You are dead with Christ. Conversely, your new man is in the likeness of his resurrection and you are alive unto God through Jesus Christ, Rom 6:5, 12. This way, when you are tempted to sin, you can look at your old man and tell him to shut up. He’s dead. You’re not going to dig him up and give him what he wants. Instead, you’re going to see what the new man wants and needs and give him those things.
Every time you are tempted to sin, just remind yourself that your old man is crucified and dead. Instead, “yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God”, Rom 6:13. By faith, let Christ live his life in you, Gal 2:20. This should help you get victory over those sins that keeping rearing their ugly head.