Reply to Objection 3: As Boethius [*Pseudo-Bede, Sent. Phil. ex Artist] says, the "being of an accident is to inhere." Hence no accident is called being as if it had being, but because by it something is; hence it is said to belong to a being rather to be a being (Metaph. vii, text. 2). And because to become and to be corrupted belong to what is, properly speaking, no accident comes into being or is corrupted, but is said to come into being and to be corrupted inasmuch as its subject begins or ceases to be in act with this accident. And thus grace is said to be created inasmuch as men are created with reference to it, i.e. are given a new being out of nothing, i.e. not from merits, according to Eph. 2:10, "created in Jesus Christ in good works."
Whether grace is the same as virtue?
Objection 1: It would seem that grace is the same as virtue. For Augustine says (De Spir. et Lit. xiv) that "operating grace is faith that worketh by charity." But faith that worketh by charity is a virtue. Therefore grace is a virtue.
Objection 2: Further, what fits the definition, fits the defined. But the definitions of virtue given by saints and philosophers fit grace, since "it makes its subject good, and his work good," and "it is a good quality of the mind, whereby we live righteously," etc. Therefore grace is virtue.
Objection 3: Further, grace is a quality. Now it is clearly not in the "fourth" species of quality; viz. "form" which is the "abiding figure of things," since it does not belong to bodies. Nor is it in the "third," since it is not a "passion nor a passion-like quality," which is in the sensitive part of the soul, as is proved in Physic. viii; and grace is principally in the mind. Nor is it in the "second" species, which is "natural power" or "impotence"; since grace is above nature and does not regard good and evil, as does natural power. Therefore it must be in the "first" species which is "habit" or "disposition." Now habits of the mind are virtues; since even knowledge itself is a virtue after a manner, as stated above (Q[57], AA[1],2). Therefore grace is the same as virtue.
On the contrary, If grace is a virtue, it would seem before all to be one of the three theological virtues. But grace is neither faith nor hope, for these can be without sanctifying grace. Nor is it charity, since "grace foreruns charity," as Augustine says in his book on the Predestination of the Saints (De Dono Persev. xvi). Therefore grace is not virtue.
I answer that, Some held that grace and virtue were identical in essence, and differed only logically---in the sense that we speak of grace inasmuch as it makes man pleasing to God, or is given gratuitously---and of virtue inasmuch as it empowers us to act rightly. And the Master seems to have thought this (Sent. ii, D 27).
But if anyone rightly considers the nature of virtue, this cannot hold, since, as the Philosopher says (Physic. vii, text. 17), "virtue is disposition of what is perfect---and I call perfect what is disposed according to its nature." Now from this it is clear that the virtue of a thing has reference to some pre-existing nature, from the fact that everything is disposed with reference to what befits its nature. But it is manifest that the virtues acquired by human acts of which we spoke above (Q[55], seqq.) are dispositions, whereby a man is fittingly disposed with reference to the nature whereby he is a man; whereas infused virtues dispose man in a higher manner and towards a higher end, and consequently in relation to some higher nature, i.e. in relation to a participation of the Divine Nature, according to 2 Pet. 1:4 : "He hath given us most great and most precious promises; that by these you may be made partakers of the Divine Nature." And it is in respect of receiving this nature that we are said to be born again sons of God.
And thus, even as the natural light of reason is something besides the acquired virtues, which are ordained to this natural light, so also the light of grace which is a participation of the Divine Nature is something besides the infused virtues which are derived from and are ordained to this light, hence the Apostle says ( Eph. 5:8 ): "For you were heretofore darkness, but now light in the Lord. Walk then as children of the light." For as the acquired virtues enable a man to walk, in accordance with the natural light of reason, so do the infused virtues enable a man to walk as befits the light of grace.
Reply to Objection 1: Augustine calls "faith that worketh by charity" grace, since the act of faith of him that worketh by charity is the first act by which sanctifying grace is manifested.
Reply to Objection 2: Good is placed in the definition of virtue with reference to its fitness with some pre-existing nature essential or participated. Now good is not attributed to grace in this manner, but as to the root of goodness in man, as stated above.
Reply to Objection 3: Grace is reduced to the first species of quality; and yet it is not the same as virtue, but is a certain disposition which is presupposed to the infused virtues, as their principle and root.
Whether grace is in the essence of the soul as in a subject, or in one of the powers?
Objection 1: It would seem that grace is not in the essence of the soul, as in a subject, but in one of the powers. For Augustine says (Hypognosticon iii [*Among the spurious works of St. Augustine]) that grace is related to the will or to the free will "as a rider to his horse." Now the will or the free will is a power, as stated above (FP, Q[83], A[2]). Hence grace is in a power of the soul, as in a subject.
Objection 2: Further, "Man's merit springs from grace" as Augustine says (De Gratia et Lib. Arbit. vi). Now merit consists in acts, which proceed from a power. Hence it seems that grace is a perfection of a power of the soul.
Objection 3: Further, if the essence of the soul is the proper subject of grace, the soul, inasmuch as it has an essence, must be capable of grace. But this is false; since it would follow that every soul would be capable of grace. Therefore the essence of the soul is not the proper subject of grace.
Objection 4: Further, the essence of the soul is prior to its powers. Now what is prior may be understood without what is posterior. Hence it follows that grace may be taken to be in the soul, although we suppose no part or power of the soul---viz. neither the will, nor the intellect, nor anything else; which is impossible.
On the contrary, By grace we are born again sons of God. But generation terminates at the essence prior to the powers. Therefore grace is in the soul's essence prior to being in the powers.
I answer that, This question depends on the preceding. For if grace is the same as virtue, it must necessarily be in the powers of the soul as in a subject; since the soul's powers are the proper subject of virtue, as stated above (Q[56], A[1]). But if grace differs from virtue, it cannot be said that a power of the soul is the subject of grace, since every perfection of the soul's powers has the nature of virtue, as stated above (Q[55], A[1]; Q[56], A[1]). Hence it remains that grace, as it is prior to virtue, has a subject prior to the powers of the soul, so that it is in the essence of the soul. For as man in his intellective powers participates in the Divine knowledge through the virtue of faith, and in his power of will participates in the Divine love through the virtue of charity, so also in the nature of the soul does he participate in the Divine Nature, after the manner of a likeness, through a certain regeneration or re-creation.
Reply to Objection 1: As from the essence of the soul flows its powers, which are the principles of deeds, so likewise the virtues, whereby the powers are moved to act, flow into the powers of the soul from grace. And thus grace is compared to the will as the mover to the moved, which is the same comparison as that of a horseman to the horse---but not as an accident to a subject.
And thereby is made clear the Reply to the Second Objection. For grace is the principle of meritorious works through the medium of virtues, as the essence of the soul is the principal of vital deeds through the medium of the powers.
Reply to Objection 3: The soul is the subject of grace, as being in the species of intellectual or rational nature. But the soul is not classed in a species by any of its powers, since the powers are natural properties of the soul following upon the species. Hence the soul differs specifically in its essence from other souls, viz. of dumb animals, and of plants. Consequently it does not follow that, if the essence of the human soul is the subject of grace, every soul may be the subject of grace; since it belongs to the essence of the soul, inasmuch as it is of such a species.
Reply to Objection 4: Since the powers of the soul are natural properties following upon the species, the soul cannot be without them. Yet, granted that it was without them, the soul would still be called intellectual or rational in its species, not that it would actually have these powers, but on account of the essence of such a species, from which these powers naturally flow.