Everything that is in us naturally stands in direct opposition to the cross of Christ. Even after we believe, there is a remnant of sin that remains inside us that will never really be defeated until we die or until the Lord comes back to take us. This indwelling sin may have been weakened inside but it’s still there lying dormant. And just when we feel confident that we are free from it, it suddenly comes back to life and sabotages our relationship with God.
The Apostle Paul recognized this when he wrote in Romans 7:21: “So I find it to be a law that when I want to do right, evil lies close at hand.” Whenever we want to do the right thing, our indwelling sin fights us left and right. It opposes us at every turn and drags us down so our spirit could not commune with God. There is not a single fiber of our being that is not infected with indwelling sin. Everything about us is contaminated.