An affliction like polio can cripple or destroy the body. An affliction like sin can cripple or destroy the spirit. The ravages of polio can now be prevented by immunization. But the ravages of sin require other means of prevention. Doctors cannot immunize against iniquity. Spiritual protection comes only from the Lord--and in His own way. Jesus chooses not to inoculate, but to indoctrinate. His method employs no vaccine; it utilizes the teaching of divine doctrine, a governing eye within, to protect the eternal spirits of His children.