The contrary hypothesis, sustained by Molina, the great body of the Jesuit theologians, Thomassinus, and the generality of modern Catholic authors, is, that the grace which is auxiliary to the will in eliciting free supernatural acts, is not efficacious ab intrinseco, but is made efficacious by the concurrence of free-will. This implies a different notion of divine concurrence from the one just stated, according to which the influx of divine power into free, spontaneous, active second causes gives merely an aid which is indeterminate, leaving free-will to its own election among two or more terms upon which it can direct this indeterminate aid. When an artilleryman sights his gun, the divine power which supports and gives efficiency to all natural laws and forces must propel the ball. But this divine power stands ready at his disposal, and will propel the ball in whatever direction, toward whatever point, he selects. So it is with the choice of free-will.

We have already indicated our adhesion to this latter hypothesis. It is far more in accordance with the doctrine of the Fathers, Latin as well as Greek, including St. Augustine himself, than the other. The former one was wholly unknown to the Greek Fathers, and does not appear in the Latin Fathers before the Pelagian controversy. Even after this period it appears, in the writings of St. Augustine and others of his school, in an entirely different form from that which was given to it by St. Thomas. That is to say, it is applied to the case of fallen man, who is supposed to need an efficacious grace on account of the weakness of his will, and to receive it as a special gift of mercy through Christ. The perseverance of those angels who stood their trial successfully is attributed, not to a grace efficacious ab intrinseco, which was withheld from the other angels, but to a right use of the same grace which was equally conceded to all, and abused by some. So, also, the fall of Adam is attributed simply to his failure of concurrence with a grace which needed only his concurrence in order to become efficacious, but was frustrated of its effect by his abuse of his own free-will. Moreover, all that St. Augustine says about efficacious grace in fallen man is reconcilable with the doctrine of congruity and sometimes directly favors it, as is proved by Antoine and others who have written in vindication of his theology from Jansenist perversions. This doctrine of congruity has been introduced in order to explain more satisfactorily the perfect liberty of the will, without denying the existence of efficacious grace differing in actu primo, or antecedently to the consent of the will, from grace merely sufficient. Although the opinion that the actual efficacy of divine grace is to the sought exclusively in the consent of the will has not been condemned, it has nevertheless been received with disfavor and generally rejected. It is commonly taught that God confers, whenever he pleases, upon men, a grace which infallibly secures their co-operation, and their final perseverance. In our view, this doctrine can the sustained by ample and certain proofs from Scripture and Tradition, and is the only one which can be completely developed in consonance with the decisions of the church, especially those of the Council of Trent respecting final perseverance. [Footnote 63]

[Footnote 63: Si quis magnum illud usque in finem perseverantiae donum se certo habiturum, absoluta et infallibili certitudine dixerit, etc. A. S.
If any one shall say that he will certainly have that great gift of perseverance to the end, with an absolute and infallible certitude, etc.
Si quis dixerit, justificatum vel sine speciali auxilio Dei, in accepta justisia perseverare posse, vel cum eo non posse. A. S.
If any one shall say that the justified man either can, without a special aid of God, persevere in the justice he has received, or can not persevere with it, let him be under the ban. De Justif. Can. 16-22.]

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The reason why certain graces are actually infallible in their effects is to be found in their congruity he to the character, disposition, and circumstances of the subject, and in their multitude. The necessity for them is not a metaphysical but a moral necessity. The fragility of our nature is such, that although a grace merely sufficient makes us metaphysically capable of persevering without sin, we are you sure to become wearied, and through fickleness, weakness of purpose, changeableness, etc., to break down somewhere. Our own consciousness and experience teach us that we need a divine and protecting arm to encompass us continually and secure us against ourselves, and they incline us to utter that prayer of the Divine Liturgy: "Compelle, Domine, rebelles voluntates nostras:" "Compel, O Lord, our rebellious wills." God, who knows human nature perfectly, can, in a thousand ways, by ordering the circumstances of life, shortening or prolonging it, regulating the influences which act on the character, alluring or terrifying the heart, illuminating the mind, impelling without coercing the will, and adapting his influences with infinite wisdom to the special state of the soul, convert whom he will, sanctify whom he will, give perseverance to whom he will, and still gain his point with the free consent and concurrence of the creature. "Non est volentis neque currentis, miserentis est Dei:" "It is not of him who willeth or of him who runneth, but of God who showeth mercy." The difficulty may still be raised, that God withholds these graces of congruity and the gift of perseverance from those who do not in the first instance accept the proffered Grace, or who do not finally persevere. But this is removed by the doctrine so ably and strenuously advocated by St. Alphonsus Liguori, that common grace is sufficient to enable one to pray fervently and do ordinary good acts; and that by prayer, with the use of other facile means, efficacious graces and the gift of perseverance may be infallibly obtained from God.

We may now return to our theme of the state of probation originally established by God for those who were made candidates for supernatural glory. We have endeavored to clear our track of difficulties impeding the clear view of the truth that God established this probation through goodness and love, or with the simple view of communicating the greatest good to the creature.

The principle questions respecting probation having been already discussed, there remains now but one, viz.: what was the precise and specific nature of the trial to which rational nature was subjected. This divides itself again into two, one respecting the trial of the angels and the other respecting the trial of man.

The angels, according to the doctrine of St. Thomas and theologians generally, were created at the summit of intelligent being, incapable of error or false judgment in their natural, intellectual operation, and therefore impeccable in the natural order. Supernatural grace was conferred upon them simultaneously with their creation, although, as F. Billuart holds, they may have concurred actively to the reception of this grace, by a spontaneous act preceding all deliberation. Grace made them capable of eliciting supernatural acts, but did not determine them to those acts without the free concurrence of their will. Their intelligence must have been, therefore, left in a certain obscurity as regards the supernatural object, in order that an error of judgment should be possible, or even an act of deliberation terminating in a free volition. What the precise object of deliberation and choice was cannot be certainly and precisely determined. It must in some way have presented the alternative of either eliciting a supernatural act by the aid of the obscure supernatural [{302}] light, or of falling back on the free, natural operation of intelligence. God must have exacted some act of homage to his sovereign will, disclosed some condition as the indispensable prerequisite to obtaining the crown of supernatural glory, which the natural intelligence of the angels could not see to be just and right without the aid of a supernatural light. This light was given, clear enough to enable the will, by a strong voluntary effort, to determine itself to act by this light, in preference to its natural light; dim enough to allow the will to turn from it voluntarily, and find in its natural light a plausible reason for withholding its submission to the supreme will. Certain passages of Scripture, and the common traditional Catholic doctrine, indicate that the angels who fell, fell through pride, and that Lucifer, in particular, their chief spirit, in some way aspired to a resemblance with God. Some have thought that he desired to become God. St. Thomas, however, says that this is impossible, because his intelligence was too perfect to permit him to conceive such a thought. He explains the sin of the angels to have consisted in a refusal to accept supernatural glory as a pure boon from God, and a wish to attain beatitude by the exertion of their own natural powers.

The most plausible supposition, in our view, is one that may be said to be contained under the more generic statement just given. It is, namely, that the angels were tried by the revelation of the Incarnation. The union of the Second Person of the Trinity with human nature, the elevation of human nature to divine glory and honor, the obligation of doing homage to Jesus Christ, as King, and to the Blessed Virgin, his mother, as Queen of Angels, was revealed, as the crucial test of the absolute obedience of the celestial spirits. According to their natural reason, and natural love of their own nature and kind, it would appear to them a violation of order and justice to pass them by, in order to assume an inferior nature partly corporeal and animal, into a hypostatic union with the Godhead; elevating this nature above their own, which was the highest in the natural order. Supernatural light suggested to them that God, as sovereign, had a right to bestow his supernatural gifts according to his own will, and, as infinitely wise, must have a secret reason for apparently inverting the order of nature in establishing the supernatural order of the universe. Those who voluntarily submitted themselves to the decree of God were rewarded by an illumination which disclose to them the wisdom and goodness of the decree of the Incarnation, and the glory which they themselves as well as the whole universe would receive from it; and thus became incapable for ever of erring in their judgment respecting the highest good, and consequently of swerving from it through sin. Those who fell turned their minds away from the supernatural light toward the consideration of their own private good, and the glory of their own persons and their own order. They revolted at the idea of being subordinated to human nature, and desired that the angelic nature should be the subject of the hypostatic union. Lucifer, in particular, as their chief, desired that he himself might be assumed into union with the Word, exalted to the throne of the universe, and deified. He and his associates demanded it from God as a right due to their natural dignity, and thus rebelled against his sovereign majesty, were cast out of the celestial sphere, and forfeited for ever the crown of supernatural glory. Hence their enmity to the Incarnate Word, to the Blessed Virgin Mary, and to the human race. Hence their efforts to establish their own supremacy over man, and the continual conflict which the holy angels and the children of God on earth must wage against them in the sacred warfare for the triumph of Christ's kingdom upon earth. This brings us to the consideration of human probation, a topic which must be reserved for a future number.