On the Freedom of the Will
12 But if the proofs which we have adduced do not appear full enough, and the similitude of the apostle seem wanting in applicability, let us add the voice of prophetic authority, and see what the prophets declare regarding those who at first, indeed, leading a righteous life, have deserved to receive numerous proofs of the goodness of God, but afterwards, as being human beings, have fallen astray, with whom the prophet, making himself also one, says: “Why, O Lord, have You made us to err from Your way? And hardened our heart, that we should not fear Your name? Return, for Your servants' sake, for the tribes of Your inheritance, that we also for a little may obtain some inheritance from Your holy hill.” Jeremiah also employs similar language: “O Lord, You have deceived us, and we were deceived; You have held (us), and You have prevailed.” The expression, then, “Why, O Lord, have You hardened our heart, that we should not fear Your name?” used by those who prayed for mercy, is to be taken in a figurative, moral acceptation, as if one were to say, “Why have You spared us so long, and did not requite us when we sinned, but abandoned us, that so our wickedness might increase, and our liberty of sinning be extended when punishment ceased?” In like manner, unless a horse continually feel the spur of his rider, and have his mouth abraded by a bit, he becomes hardened. And a boy also, unless constantly disciplined by chastisement, will grow up to be an insolent youth, and one ready to fall headlong into vice. God accordingly abandons and neglects those whom He has judged undeserving of chastisement: “For whom the Lord loves He chastens, and scourges every son whom He receives.” From which we are to suppose that those are to be received into the rank and affection of sons, who have deserved to be scourged and chastened by the Lord, in order that they also, through endurance of trials and tribulations, may be able to say, “Who shall separate us from the love of God which is in Christ Jesus? Shall tribulation, or anguish, or famine, or nakedness, or peril, or sword?” For by all these is each one's resolution manifested and displayed, and the firmness of his perseverance made known, not so much to God, who knows all things before they happen, as to the rational and heavenly virtues, who have obtained a part in the work of procuring human salvation, as being a sort of assistants and ministers to God. Those, on the other hand, who do not yet offer themselves to God with such constancy and affection, and are not ready to come into His service, and to prepare their souls for trial, are said to be abandoned by God, i.e., not to be instructed, inasmuch as they are not prepared for instruction, their training or care being undoubtedly postponed to a later time. These certainly do not know what they will obtain from God, unless they first entertain the desire of being benefited; and this finally will be the case, if a man come first to a knowledge of himself, and feel what are his defects, and understand from whom he either ought or can seek the supply of his deficiencies. For he who does not know beforehand of his weakness or his sickness, cannot seek a physician; or at least, after recovering his health, that man will not be grateful to his physician who did not first recognise the dangerous nature of his ailment. And so, unless a man has first ascertained the defects of his life, and the evil nature of his sins, and made this known by confession from his own lips, he cannot be cleansed or acquitted, lest he should be ignorant that what he possesses has been bestowed on him by favour, but should consider as his own property what flows from the divine liberality, which idea undoubtedly generates arrogance of mind and pride, and finally becomes the cause of the individual's ruin. And this, we must believe, was the case with the devil, who viewed as his own, and not as given him by God, the primacy which he held at the time when he was unstained; and thus was fulfilled in him the declaration, that “every one who exalts himself shall be abased.” From which it appears to me that the divine mysteries were concealed from the wise and prudent, according to the statement of Scripture, that “no flesh should glory before God,” and revealed to children— to those, namely, who, after they have become infants and little children, i.e., have returned to the humility and simplicity of children, then make progress; and on arriving at perfection, remember that they have obtained their state of happiness, not by their own merits, but by the grace and compassion of God.
13. It is therefore by the sentence of God that he is abandoned who deserves to be so, while over some sinners God exercises forbearance; not, however, without a definite principle of action. Nay, the very fact that He is long-suffering conduces to the advantage of those very persons, since the soul over which He exercises this providential care is immortal; and, as being immortal and everlasting, it is not, although not immediately cared for, excluded from salvation, which is postponed to a more convenient time. For perhaps it is expedient for those who have been more deeply imbued with the poison of wickedness to obtain this salvation at a later period. For as medical men sometimes, although they could quickly cover over the scars of wounds, keep back and delay the cure for the present, in the expectation of a better and more perfect recovery, knowing that it is more salutary to retard the treatment in the cases of swellings caused by wounds, and to allow the malignant humours to flow off for a while, rather than to hasten a superficial cure, by shutting up in the veins the poison of a morbid humour, which, excluded from its customary outlets, will undoubtedly creep into the inner parts of the limbs, and penetrate to the very vitals of the viscera, producing no longer mere disease in the body, but causing destruction to life; so, in like manner, God also, who knows the secret things of the heart, and foreknows the future, in much forbearance allows certain events to happen, which, coming from without upon men, cause to come forth into the light the passions and vices which are concealed within, that by their means those may be cleansed and cured who, through great negligence and carelessness, have admitted within themselves the roots and seeds of sins, so that, when driven outwards and brought to the surface, they may in a certain degree be cast forth and dispersed. And thus, although a man may appear to be afflicted with evils of a serious kind, suffering convulsions in all his limbs, he may nevertheless, at some future time, obtain relief and a cessation from his trouble; and, after enduring his afflictions to satiety, may, after many sufferings, be restored again to his (proper) condition. For God deals with souls not merely with a view to the short space of our present life, included within sixty years or more, but with reference to a perpetual and never-ending period, exercising His providential care over souls that are immortal, even as He Himself is eternal and immortal. For He made the rational nature, which He formed in His own image and likeness, incorruptible; and therefore the soul, which is immortal, is not excluded by the shortness of the present life from the divine remedies and cures.
Source: De Principiis (New Advent)