This summer working at the hospital, I’ve had several visits with people in isolation rooms. To go visit them, I have to put on a gown and rubber gloves and sometimes a mask. When I leave the room, I throw all these things away and wash my hands again.
I do all this because the person is infected and diseased and cannot be let out of the room.
Now, by one way of thinking, the doctor’s work is to kill off the infection, so the patient will be saved. But thought of another way, the real problem the patient has here is that he is dangerous to everyone around him and can’t leave that room. The ultimate bad result is that he will die and never leave that room again. What he needs to be liberated from is that isolated room and freed to be back in the world again. In order to do that, his infection has to be purged from him. Killing the infection is a means by which his liberation from isolation is made possible.
By way of analogy, sin is a contamination and disease. So long as we are so infected, we cannot get out of the isolation cell know as the world, both because we are too weak to do it but not inconsequentially because we are dangerous to those on the outside. Granted, it is a spacious and often comfortable isolation room, but we are trapped and unable to enter the world that is without sin and corruption so long as we are tainted.
Jesus came to usher us into that holy, pure, and beautiful kingdom. But first, our sins must be purged by the means of cross and forgiveness. Our sin must be dealt with as a necessary step to salvation, but that is not salvation itself. Salvation is getting out of the room.
Like all analogies, this is clumsy and limited, but I think there is something useful here.