Actual grace may therefore be defined as an unmerited, supernatural, internal divine help, based on the merits of Jesus Christ, which renders man pleasing in the sight of God, enabling him to perform salutary acts; or, somewhat more succinctly, as a supernatural help bestowed for the performance of salutary acts, in consideration of the merits of Jesus Christ.
Actual grace is (1) a help (auxilium), because it consists in a transient influence exercised by God on the soul. (2) A supernatural help, to distinguish it from God's ordinary providence and all such merely natural graces as man would probably have received in the state of pure nature.[26] (3) It is attributed to the merits of Jesus Christ, in order to indicate that the graces granted to fallen man are all derived from the atonement both as their efficient and their meritorious cause. (4) Actual grace is said to be given for the performance of salutary acts to show that its immediate purpose or end is an act, not a state, and that the acts for which it is given must be in the order of salvation.
7. The Twofold Causality of Actual Grace.—If grace is a supernatural help, mere nature cannot, of its own strength, perform salutary acts. Consequently, actual grace exercises a [pg 016] causal influence without which man would be helpless in the matter of salvation.
The causality of actual grace is both moral and physical.
a) As a moral cause grace removes the obstacles which render the work of salvation difficult. Besides this negative it also has a positive effect: it inspires delight in virtue and hatred of sin.
This mode of operation manifestly presupposes a certain weakness of the human will, i.e. concupiscence, which is an effect of original sin. Actual grace exercises a healing influence on the will[27] and is therefore called gratia sanans sive medicinalis. “Unless something is put before the soul to please and attract it,” says St. Augustine, “the will can in no wise be moved; but it is not in man's power to bring this about.”[28] Concretely, this moral causality of grace manifests itself as a divinely inspired joy in virtue and a hatred of sin, both of which incline the will to the free performance of salutary acts. These sentiments may in some cases be so strong as to deprive the will temporarily of its freedom to resist. The sudden conversion of St. Paul is a case in point. Holy Scripture expressly assures us that God is the absolute master of the human will and, if He so chooses, can bend it under His yoke without using physical force. Cfr. Prov. XXI, 1: “The heart of the king is in the hand of the Lord: whithersoever he will, [pg 017] he shall turn it.” “Who will be so foolish as to say,” queries St. Augustine, “that God cannot change the evil wills of men, whichever, whenever, and wheresoever He chooses, and direct them to what is good?”[29] It is but rarely, of course, that God grants to any man a summary victory over his sinful nature; but this fact does not prevent the Church from praying: “Vouchsafe, O Lord, to compel our wills to thee, even though they be rebellious.”[30]
b) Even more important than the moral causality of grace is its physical causality. Man depends entirely on God for the physical strength necessary to perform salutary works. Grace elevates the faculties of the soul to the supernatural sphere, thereby enabling it to perform supernatural acts.
Physical is as distinct from moral causality in the order of grace as in the order of nature. The holding out of a beautiful toy will not enable a child to walk without support from its elders. Moral causality is insufficient to enable a man to perform salutary acts. Grace (as we shall show later) is absolutely, i.e. metaphysically, necessary for all salutary acts, whether easy or difficult, and hence the incapacity of nature cannot be ascribed solely to weakness and to the moral difficulty resulting from sin, but must be attributed mainly to physical impotence. A bird without wings is not merely impeded but utterly unable [pg 018] to fly; similarly, man without grace is not only handicapped but absolutely incapacitated for the work of salvation. Considered under this aspect, actual grace is called gratia elevans, because it elevates man to the supernatural state.[31]
This double causality of grace is well brought out in Perrone's classic definition: “Gratia actualis est gratuitum illud auxilium,[32] quod Deus[33] per Christi merita[34] homini lapso[35] largitur, tum ut eius infirmitati consulat,[36] ... tum ut eum erigat ad statum supernaturalem atque idoneum faciat ad actus supernaturales eliciendos,[37] ut iustificationem possit adipisci[38] in eaque iam consecuta perseverare, donec perveniat ad vitam aeternam.”[39] In English: “Actual grace is that unmerited interior assistance which God, by virtue of the merits of Christ, confers upon fallen man, in order, on the one hand, to remedy his infirmity resulting from sin and, on the other, to raise him to the supernatural order and thereby to render him capable of performing supernatural acts, so that he may attain justification, persevere in it to the end, and thus enter into everlasting life.” This definition is strictly scientific, for it enumerates all the elements that enter into the essence of actual grace.