Chapter 20 — Part II: The Sacraments — Extreme Unction
Section 23. This manner of administering Extreme Unction is observed throughout the universal Church, and is in keeping with the medicinal nature of the Sacrament. As in corporal disease, although the malady affects the entire body, yet the cure is applied to that part only which is the seat and origin of the disease; so likewise this Sacrament is applied not to the entire body, but to those members in which the power of sensation is most conspicuous, and also to the loins, which are, as it were, the seat of concupiscence, and to the feet, by which we move from one place to another.