We have before us three things: a fact—“our old man was crucified with him”; a consequence—“that the body of sin might be done away”; and a design—“that so we should no longer be in bondage to sin.” (Romans 6:6)
Nevertheless, even after we take the action and maintain the attitude of reckoning our old man to be dead, the sinful nature in us does not henceforth become annihilated and disappear. For as long as we live in this mortal body, the sinful nature will co-exist with us. To say that our sinful nature can be annihilated in this life is a great heresy. We can deliver the old man to death by the power of the cross of Calvary and render it powerless and withered as though dead, but we cannot annihilate it.
Whenever we are careless and unwatchful, whenever we do not stand on the death ground of Calvary, our old man will renew its activities and resume its office. Satan is always looking for an opportunity to reactivate the old man. And as soon as there is a loophole, the old man will recover its original position.