Whether every sign of a holy thing is a sacrament?
Objection 1: It seems that not every sign of a sacred thing is a sacrament. For all sensible creatures are signs of sacred things; according to Rom. 1:20: "The invisible things of God are clearly seen being understood by the things that are made." And yet all sensible things cannot be called sacraments. Therefore not every sign of a sacred thing is a sacrament.
Objection 2: Further, whatever was done under the Old Law was a figure of Christ Who is the "Holy of Holies" (Dan. 9:24), according to 1 Cor. 10:11: "All (these) things happened to them in figure"; and Col. 2:17: "Which are a shadow of things to come, but the body is Christ's." And yet not all that was done by the Fathers of the Old Testament, not even all the ceremonies of the Law, were sacraments, but only in certain special cases, as stated in the FS, Q 101, A 4. Therefore it seems that not every sign of a sacred thing is a sacrament.
Objection 3: Further, even in the New Testament many things are done in sign of some sacred thing; yet they are not called sacraments; such as sprinkling with holy water, the consecration of an altar, and such like. Therefore not every sign of a sacred thing is a sacrament.
On the contrary, A definition is convertible with the thing defined. Now some define a sacrament as being "the sign of a sacred thing"; moreover, this is clear from the passage quoted above (A 1) from Augustine. Therefore it seems that every sign of a sacred thing is a sacrament.
I answer that, Signs are given to men, to whom it is proper to discover the unknown by means of the known. Consequently a sacrament properly so called is that which is the sign of some sacred thing pertaining to man; so that properly speaking a sacrament, as considered by us now, is defined as being the "sign of a holy thing so far as it makes men holy."
Reply to Objection 1: Sensible creatures signify something holy, viz. Divine wisdom and goodness inasmuch as these are holy in themselves; but not inasmuch as we are made holy by them. Therefore they cannot be called sacraments as we understand sacraments now.
Reply to Objection 2: Some things pertaining to the Old Testament signified the holiness of Christ considered as holy in Himself. Others signified His holiness considered as the cause of our holiness; thus the sacrifice of the Paschal Lamb signified Christ's Sacrifice whereby we are made holy: and such like are properly styled sacraments of the Old Law.
Reply to Objection 3: Names are given to things considered in reference to their end and state of completeness. Now a disposition is not an end, whereas perfection is. Consequently things that signify disposition to holiness are not called sacraments, and with regard to these the objection is verified: only those are called sacraments which signify the perfection of holiness in man.
III · Q. 60, Art. 3: Whether a sacrament is a sign of one thing only?
Whether a sacrament is a sign of one thing only?
Objection 1: It seems that a sacrament is a sign of one thing only. For that which signifies many things is an ambiguous sign, and consequently occasions deception: this is clearly seen in equivocal words. But all deception should be removed from the Christian religion, according to Col. 2:8: "Beware lest any man cheat you by philosophy and vain deceit." Therefore it seems that a sacrament is not a sign of several things.
Objection 2: Further, as stated above (A 2), a sacrament signifies a holy thing in so far as it makes man holy. But there is only one cause of man's holiness, viz. the blood of Christ; according to Heb. 13:12: "Jesus, that He might sanctify the people by His own blood, suffered without the gate." Therefore it seems that a sacrament does not signify several things.
Objection 3: Further, it has been said above (A 2, ad 3) that a sacrament signifies properly the very end of sanctification. Now the end of sanctification is eternal life, according to Rom. 6:22: "You have your fruit unto sanctification, and the end life everlasting." Therefore it seems that the sacraments signify one thing only, viz. eternal life.
On the contrary, In the Sacrament of the Altar, two things are signified, viz. Christ's true body, and Christ's mystical body; as Augustine says (Liber Sent. Prosper.).
I answer that, As stated above (A 2) a sacrament properly speaking is that which is ordained to signify our sanctification. In which three things may be considered; viz. the very cause of our sanctification, which is Christ's passion; the form of our sanctification, which is grace and the virtues; and the ultimate end of our sanctification, which is eternal life. And all these are signified by the sacraments. Consequently a sacrament is a sign that is both a reminder of the past, i.e. the passion of Christ; and an indication of that which is effected in us by Christ's passion, i.e. grace; and a prognostic, that is, a foretelling of future glory.
Reply to Objection 1: Then is a sign ambiguous and the occasion of deception, when it signifies many things not ordained to one another. But when it signifies many things inasmuch as, through being mutually ordained, they form one thing, then the sign is not ambiguous but certain: thus this word "man" signifies the soul and body inasmuch as together they form the human nature. In this way a sacrament signifies the three things aforesaid, inasmuch as by being in a certain order they are one thing.
Reply to Objection 2: Since a sacrament signifies that which sanctifies, it must needs signify the effect, which is implied in the sanctifying cause as such.
Reply to Objection 3: It is enough for a sacrament that it signify that perfection which consists in the form, nor is it necessary that it should signify only that perfection which is the end.