Objection 3: Further, God's mercy and liberality infinitely surpass human mercy and liberality. Now a man may merit from another, even though he has not hitherto had his grace. Much more, therefore, would it seem that a man without grace may merit eternal life.
On the contrary, The Apostle says ( Rom. 6:23 ): "The grace of God, life everlasting."
I answer that, Man without grace may be looked at in two states, as was said above (Q[109], A[2]): the first, a state of perfect nature, in which Adam was before his sin; the second, a state of corrupt nature, in which we are before being restored by grace. Therefore, if we speak of man in the first state, there is only one reason why man cannot merit eternal life without grace, by his purely natural endowments, viz. because man's merit depends on the Divine pre-ordination. Now no act of anything whatsoever is divinely ordained to anything exceeding the proportion of the powers which are the principles of its act; for it is a law of Divine providence that nothing shall act beyond its powers. Now everlasting life is a good exceeding the proportion of created nature; since it exceeds its knowledge and desire, according to 1 Cor. 2:9 : "Eye hath not seen, nor ear heard, neither hath it entered into the heart of man." And hence it is that no created nature is a sufficient principle of an act meritorious of eternal life, unless there is added a supernatural gift, which we call grace. But if we speak of man as existing in sin, a second reason is added to this, viz. the impediment of sin. For since sin is an offense against God, excluding us from eternal life, as is clear from what has been said above (Q[71], A[6]; Q[113], A[2]), no one existing in a state of mortal sin can merit eternal life unless first he be reconciled to God, through his sin being forgiven, which is brought about by grace. For the sinner deserves not life, but death, according to Rom. 6:23 : "The wages of sin is death."
Reply to Objection 1: God ordained human nature to attain the end of eternal life, not by its own strength, but by the help of grace; and in this way its act can be meritorious of eternal life.
Reply to Objection 2: Without grace a man cannot have a work equal to a work proceeding from grace, since the more perfect the principle, the more perfect the action. But the objection would hold good, if we supposed the operations equal in both cases.
Reply to Objection 3: With regard to the first reason adduced, the case is different in God and in man. For a man receives all his power of well-doing from God, and not from man. Hence a man can merit nothing from God except by His gift, which the Apostle expresses aptly saying ( Rom. 11:35 ): "Who hath first given to Him, and recompense shall be made to him?" But man may merit from man, before he has received anything from him, by what he has received from God.
But as regards the second proof taken from the impediment of sin, the case is similar with man and God, since one man cannot merit from another whom he has offended, unless he makes satisfaction to him and is reconciled.
Whether a man in grace can merit eternal life condignly?
Objection 1: It would seem that a man in grace cannot merit eternal life condignly, for the Apostle says ( Rom. 8:18 ): "The sufferings of this time are not worthy [condignae] to be compared with the glory to come, that shall be revealed in us." But of all meritorious works, the sufferings of the saints would seem the most meritorious. Therefore no works of men are meritorious of eternal life condignly.
Objection 2: Further, on Rom. 6:23, "The grace of God, life everlasting," a gloss says: "He might have truly said: 'The wages of justice, life everlasting'; but He preferred to say 'The grace of God, life everlasting,' that we may know that God leads us to life everlasting of His own mercy and not by our merits." Now when anyone merits something condignly he receives it not from mercy, but from merit. Hence it would seem that a man with grace cannot merit life everlasting condignly.
Objection 3: Further, merit that equals the reward, would seem to be condign. Now no act of the present life can equal everlasting life, which surpasses our knowledge and our desire, and moreover, surpasses the charity or love of the wayfarer, even as it exceeds nature. Therefore with grace a man cannot merit eternal life condignly.
On the contrary, What is granted in accordance with a fair judgment, would seem a condign reward. But life everlasting is granted by God, in accordance with the judgment of justice, according to 2 Tim. 4:8 : "As to the rest, there is laid up for me a crown of justice, which the Lord, the just judge, will render to me in that day." Therefore man merits everlasting life condignly.
I answer that, Man's meritorious work may be considered in two ways: first, as it proceeds from free-will; secondly, as it proceeds from the grace of the Holy Ghost. If it is considered as regards the substance of the work, and inasmuch as it springs from the free-will, there can be no condignity because of the very great inequality. But there is congruity, on account of an equality of proportion: for it would seem congruous that, if a man does what he can, God should reward him according to the excellence of his power.
If, however, we speak of a meritorious work, inasmuch as it proceeds from the grace of the Holy Ghost moving us to life everlasting, it is meritorious of life everlasting condignly. For thus the value of its merit depends upon the power of the Holy Ghost moving us to life everlasting according to Jn. 4:14 : "Shall become in him a fount of water springing up into life everlasting." And the worth of the work depends on the dignity of grace, whereby a man, being made a partaker of the Divine Nature, is adopted as a son of God, to whom the inheritance is due by right of adoption, according to Rom. 8:17 : "If sons, heirs also."
Reply to Objection 1: The Apostle is speaking of the substance of these sufferings.
Reply to Objection 2: This saying is to be understood of the first cause of our reaching everlasting life, viz. God's mercy. But our merit is a subsequent cause.
Reply to Objection 3: The grace of the Holy Ghost which we have at present, although unequal to glory in act, is equal to it virtually as the seed of a tree, wherein the whole tree is virtually. So likewise by grace of the Holy Ghost dwells in man; and He is a sufficient cause of life everlasting; hence, 2 Cor. 1:22, He is called the "pledge" of our inheritance.
Whether grace is the principle of merit through charity rather than the other virtues?
Objection 1: It would seem that grace is not the principle of merit through charity rather than the other virtues. For wages are due to work, according to Mat. 20:8 : "Call the laborers and pay them their hire." Now every virtue is a principle of some operation, since virtue is an operative habit, as stated above (Q[55], A[2]). Hence every virtue is equally a principle of merit.
Objection 2: Further, the Apostle says ( 1 Cor. 3:8 ): "Every man shall receive his own reward according to his labor." Now charity lessens rather than increases the labor, because as Augustine says (De Verbis Dom., Serm. lxx), "love makes all hard and repulsive tasks easy and next to nothing." Hence charity is no greater principle of merit than any other virtue.
Objection 3: Further, the greatest principle of merit would seem to be the one whose acts are most meritorious. But the acts of faith and patience or fortitude would seem to be the most meritorious, as appears in the martyrs, who strove for the faith patiently and bravely even till death. Hence other virtues are a greater principle of merit than charity.
On the contrary, Our Lord said ( Jn. 14:21 ): "He that loveth Me, shall be loved of My Father; and I will love him and will manifest Myself to him." Now everlasting life consists in the manifest knowledge of God, according to Jn. 17:3 : "This is eternal life: that they may know Thee, the only true" and living "God." Hence the merit of eternal life rests chiefly with charity.
I answer that, As we may gather from what has been stated above (A[1]), human acts have the nature of merit from two causes: first and chiefly from the Divine ordination, inasmuch as acts are said to merit that good to which man is divinely ordained. Secondly, on the part of free-will, inasmuch as man, more than other creatures, has the power of voluntary acts by acting by himself. And in both these ways does merit chiefly rest with charity. For we must bear in mind that everlasting life consists in the enjoyment of God. Now the human mind's movement to the fruition of the Divine good is the proper act of charity, whereby all the acts of the other virtues are ordained to this end, since all the other virtues are commanded by charity. Hence the merit of life everlasting pertains first to charity, and secondly, to the other virtues, inasmuch as their acts are commanded by charity. So, likewise, is it manifest that what we do out of love we do most willingly. Hence, even inasmuch as merit depends on voluntariness, merit is chiefly attributed to charity.
Reply to Objection 1: Charity, inasmuch as it has the last end for object, moves the other virtues to act. For the habit to which the end pertains always commands the habits to which the means pertain, as was said above (Q[9], A[1]).
Reply to Objection 2: A work can be toilsome and difficult in two ways: first, from the greatness of the work, and thus the greatness of the work pertains to the increase of merit; and thus charity does not lessen the toil---rather, it makes us undertake the greatest toils, "for it does great things, if it exists," as Gregory says (Hom. in Evang. xxx). Secondly, from the defect of the operator; for what is not done with a ready will is hard and difficult to all of us, and this toil lessens merit and is removed by charity.