Chapter 15 — Part II: The Sacraments — Introduction on the Sacraments in General
Section 21. All The Sacraments Signify Something Present, Something Past, Something Future: — This applies to all the Sacraments; for all of them declare not only our sanctity and justification, but also two other things most intimately connected with sanctification, namely, the Passion of Christ our Redeemer, which is the source of our sanctification, and also eternal life and heavenly bliss, which are the end of sanctification. Such, then, being the nature of all the Sacraments, holy Doctors justly hold that each of them has a threefold significance: they remind us of something past; they indicate and point out something present; they foretell something future.