Sadhu Sundar Singh

Not every single member of the body needs to become useless and weak before death occurs. A weakness of, or a blow upon, the heart or the brain will suffice to bring an end to life. However strong and healthy other parts of the body may be. Thus, one sin, by its poisonous effect on the mind and heart, is sufficient to ruin the spiritual life not only of one but also of a whole family or nation, even of the entire race. Such was the sin of Adam.