Chapter 15 — Part II: The Sacraments — Introduction on the Sacraments in General
Section 6. Let it not, however, be supposed that the word sacrament is of recent ecclesiastical usage. Whoever peruses the works of Saints Jerome and Augustine will at once perceive that ancient ecclesiastical writers made use of the word sacrament, and some times also of the word symbol, or mystical sign or sacred sign, to designate that of which we here speak.