OF THE SACRAMENTS' PRINCIPAL EFFECT, WHICH IS GRACE (SIX ARTICLES)
We have now to consider the effect of the sacraments. First of their principal effect, which is grace; secondly, of their secondary effect, which is a character. Concerning the first there are six points of inquiry:
(1) Whether the sacraments of the New Law are the cause of grace?
(2) Whether sacramental grace confers anything in addition to the grace of the virtues and gifts?
(3) Whether the sacraments contain grace?
(4) Whether there is any power in them for the causing of grace?
(5) Whether the sacraments derive this power from Christ's Passion?
(6) Whether the sacraments of the Old Law caused grace?
Whether the sacraments are the cause of grace?
Objection 1: It seems that the sacraments are not the cause of grace. For it seems that the same thing is not both sign and cause: since the nature of sign appears to be more in keeping with an effect. But a sacrament is a sign of grace. Therefore it is not its cause.
Objection 2: Further, nothing corporeal can act on a spiritual thing: since "the agent is more excellent than the patient," as Augustine says (Gen. ad lit. xii). But the subject of grace is the human mind, which is something spiritual. Therefore the sacraments cannot cause grace.
Objection 3: Further, what is proper to God should not be ascribed to a creature. But it is proper to God to cause grace, according to Ps. 83:12 : "The Lord will give grace and glory." Since, therefore, the sacraments consist in certain words and created things, it seems that they cannot cause grace.
On the contrary, Augustine says (Tract. lxxx in Joan.) that the baptismal water "touches the body and cleanses the heart." But the heart is not cleansed save through grace. Therefore it causes grace: and for like reason so do the other sacraments of the Church.
I answer that, We must needs say that in some way the sacraments of the New Law cause grace. For it is evident that through the sacraments of the New Law man is incorporated with Christ: thus the Apostle says of Baptism ( Gal. 3:27 ): "As many of you as have been baptized in Christ have put on Christ." And man is made a member of Christ through grace alone.
Some, however, say that they are the cause of grace not by their own operation, but in so far as God causes grace in the soul when the sacraments are employed. And they give as an example a man who on presenting a leaden coin, receives, by the king's command, a hundred pounds: not as though the leaden coin, by any operation of its own, caused him to be given that sum of money; this being the effect of the mere will of the king. Hence Bernard says in a sermon on the Lord's Supper: "Just as a canon is invested by means of a book, an abbot by means of a crozier, a bishop by means of a ring, so by the various sacraments various kinds of grace are conferred." But if we examine the question properly, we shall see that according to the above mode the sacraments are mere signs. For the leaden coin is nothing but a sign of the king's command that this man should receive money. In like manner the book is a sign of the conferring of a canonry. Hence, according to this opinion the sacraments of the New Law would be mere signs of grace; whereas we have it on the authority of many saints that the sacraments of the New Law not only signify, but also cause grace.
We must therefore say otherwise, that an efficient cause is twofold, principal and instrumental. The principal cause works by the power of its form, to which form the effect is likened; just as fire by its own heat makes something hot. In this way none but God can cause grace: since grace is nothing else than a participated likeness of the Divine Nature, according to 2 Pet. 1:4 : "He hath given us most great and precious promises; that we may be [Vulg.: 'you may be made'] partakers of the Divine Nature." But the instrumental cause works not by the power of its form, but only by the motion whereby it is moved by the principal agent: so that the effect is not likened to the instrument but to the principal agent: for instance, the couch is not like the axe, but like the art which is in the craftsman's mind. And it is thus that the sacraments of the New Law cause grace: for they are instituted by God to be employed for the purpose of conferring grace. Hence Augustine says (Contra Faust. xix): "All these things," viz. pertaining to the sacraments, "are done and pass away, but the power," viz. of God, "which works by them, remains ever." Now that is, properly speaking, an instrument by which someone works: wherefore it is written ( Titus 3:5 ): "He saved us by the laver of regeneration."
Reply to Objection 1: The principal cause cannot properly be called a sign of its effect, even though the latter be hidden and the cause itself sensible and manifest. But an instrumental cause, if manifest, can be called a sign of a hidden effect, for this reason, that it is not merely a cause but also in a measure an effect in so far as it is moved by the principal agent. And in this sense the sacraments of the New Law are both cause and signs. Hence, too, is it that, to use the common expression, "they effect what they signify." From this it is clear that they perfectly fulfil the conditions of a sacrament; being ordained to something sacred, not only as a sign, but also as a cause.
Reply to Objection 2: An instrument has a twofold action; one is instrumental, in respect of which it works not by its own power but by the power of the principal agent: the other is its proper action, which belongs to it in respect of its proper form: thus it belongs to an axe to cut asunder by reason of its sharpness, but to make a couch, in so far as it is the instrument of an art. But it does not accomplish the instrumental action save by exercising its proper action: for it is by cutting that it makes a couch. In like manner the corporeal sacraments by their operation, which they exercise on the body that they touch, accomplish through the Divine institution an instrumental operation on the soul; for example, the water of baptism, in respect of its proper power, cleanses the body, and thereby, inasmuch as it is the instrument of the Divine power, cleanses the soul: since from soul and body one thing is made. And thus it is that Augustine says (Gen. ad lit. xii) that it "touches the body and cleanses the heart."
Reply to Objection 3: This argument considers that which causes grace as principal agent; for this belongs to God alone, as stated above.
Whether sacramental grace confers anything in addition to the grace of the virtues and gifts?
Objection 1: It seems that sacramental grace confers nothing in addition to the grace of the virtues and gifts. For the grace of the virtues and gifts perfects the soul sufficiently, both in its essence and in its powers; as is clear from what was said in the FS, Q[110], AA[3],4. But grace is ordained to the perfecting of the soul. Therefore sacramental grace cannot confer anything in addition to the grace of the virtues and gifts.
Objection 2: Further, the soul's defects are caused by sin. But all sins are sufficiently removed by the grace of the virtues and gifts: because there is no sin that is not contrary to some virtue. Since, therefore, sacramental grace is ordained to the removal of the soul's defects, it cannot confer anything in addition to the grace of the virtues and gifts.
Objection 3: Further, every addition or subtraction of form varies the species (Metaph. viii). If, therefore, sacramental grace confers anything in addition to the grace of the virtues and gifts, it follows that it is called grace equivocally: and so we are none the wiser when it is said that the sacraments cause grace.
On the contrary, If sacramental grace confers nothing in addition to the grace of the virtues and gifts, it is useless to confer the sacraments on those who have the virtues and gifts. But there is nothing useless in God's works. Therefore it seems that sacramental grace confers something in addition to the grace of the virtues and gifts.
I answer that, As stated in the FS, Q[110], AA[3],4, grace, considered in itself, perfects the essence of the soul, in so far as it is a certain participated likeness of the Divine Nature. And just as the soul's powers flow from its essence, so from grace there flow certain perfections into the powers of the soul, which are called virtues and gifts, whereby the powers are perfected in reference to their actions. Now the sacraments are ordained unto certain special effects which are necessary in the Christian life: thus Baptism is ordained unto a certain spiritual regeneration, by which man dies to vice and becomes a member of Christ: which effect is something special in addition to the actions of the soul's powers: and the same holds true of the other sacraments. Consequently just as the virtues and gifts confer, in addition to grace commonly so called, a certain special perfection ordained to the powers' proper actions, so does sacramental grace confer, over and above grace commonly so called, and in addition to the virtues and gifts, a certain Divine assistance in obtaining the end of the sacrament. It is thus that sacramental grace confers something in addition to the grace of the virtues and gifts.