It was not long, however, before the controversy was driven out of the region of sermons into that of regular treatises. The occasion for Augustin's first appearance in a written document bearing on the controversy, was given by certain questions which were sent to him for answer by "the tribune and notary" Marcellinus, with whom he had cemented his intimacy at Carthage, the previous year, when this notable official was presiding, by the emperor's orders, over the great conference of the catholics and Donatists. The mere fact that Marcellinus, still at Carthage, where Coelestius had been brought to trial, wrote to Augustin at Hippo for written answers to important questions connected with the Pelagian heresy, speaks volumes for the prominent position he had already assumed in the controversy. The questions that were sent, concerned the connection of death with sin, the transmission of sin, the possibility of a sinless life, and especially infants' need of baptism. [48] Augustin was immersed in abundant labours when they reached him: [49] but he could not resist this appeal, and that the less as the Pelagian controversy had already grown to a place of the first importance in his eyes. The result was his treatise, On the Merits and Remission of Sins and on the Baptism of Infants, consisting of two books, and written in 412. The first book of this work is an argument for original sin, drawn from the universal reign of death in the world (2-8), from the teaching of Rom. v. 12-21 (9-20), and chiefly from the baptism of infants (21-70). [50] It opens by exploding the Pelagian contention that death is of nature, and Adam would have died even had he not sinned, by showing that the penalty threatened to Adam included physical death (Gen. iii. 19), and that it is due to him that we all die (Rom. viii. 10, 11; 1 Cor. xv. 21) (2-8). Then the Pelagian assertion that we are injured in Adam's sin only by its bad example, which we imitate, not by any propagation from it, is tested by an exposition of Rom. v. 12 sq. (9-20). And then the main subject of the book is reached, and the writer sharply presses the Pelagians with the universal and primeval fact of the baptism of infants, as a proof of original sin (21-70). He tracks out all their subterfuges,--showing the absurdity of the assertions that infants are baptized for the remission of sins that they have themselves committed since birth (22), or in order to obtain a higher stage of salvation (23-28), or because of sin committed in some previous state of existence (31-33). Then turning to the positive side, he shows at length that the Scriptures teach that Christ came to save sinners, that baptism is for the remission of sins, and that all that partake of it are confessedly sinners (34 sq.); then he points out that John ii. 7, 8, on which the Pelagians relied, cannot be held to distinguish between ordinary salvation and a higher form, under the name of "the kingdom of God" (58 sq.); and he closes by showing that the very manner in which baptism was administered, with its exorcism and exsufflation, implied the infant to be a sinner (63), and by suggesting that the peculiar helplessness of infancy, so different not only from the earliest age of Adam, but also from that of many young animals, may possibly be itself penal (64-69). The second book treats, with similar fulness, the question of the perfection of human righteousness in this life. After an exordium which speaks of the will and its limitations, and of the need of God's assisting grace (1-6), the writer raises four questions. First, whether it may be said to be possible, by God's grace, for a man to attain a condition of entire sinlessness in this life (7). This he answers in the affirmative. Secondly, he asks, whether any one has ever done this, or may ever be expected to do it, and answers in the negative on the testimony of Scripture (8-25). Thirdly, he asks why not, and replies briefly because men are unwilling, explaining at length what he means by this (26-33). Finally, he inquires whether any man has ever existed, exists now, or will ever exist, entirely without sin,--this question differing from the second inasmuch as that asked after the attainment in this life of a state in which sinning should cease, while this seeks a man who has never been guilty of sin, implying the absence of original as well as of actual sin. After answering this in the negative (34), Augustin discusses anew the question of original sin. Here after expounding from the positive side (35-38) the condition of man in paradise, the nature of his probation, and of the fall and its effects both on him and his posterity, and the kind of redemption that has been provided in the incarnation, he proceeds to answer certain cavils (39 sq.), such as, "Why should children of baptized people need baptism?"--"How can a sin be remitted to the father and held against the child?"--"If physical death comes from Adam, ought we not to be released from it on believing in Christ?"--and concludes with an exhortation to hold fast to the exact truth, turning neither to the right nor left,--neither saying that we have no sin, nor surrendering ourselves to our sin (57 sq.).
After these books were completed, Augustin came into possession of Pelagius' Commentary on Paul's Epistles, which was written while he was living in Rome (before 410), and found it to contain some arguments that he had not treated,--such arguments, he tells us, as he had not imagined could be held by any one. [51] Unwilling to re-open his finished argument, he now began a long supplementary letter to Marcellinus, which he intended to serve as a third and concluding book to his work. He was some time in completing this letter. He had asked to have the former two books returned to him; and it is a curious indication of his overworked state of mind, that he forgot what he wanted with them: [52] he visited Carthage while the letter was in hand, and saw Marcellinus personally; and even after his return to Hippo, it dragged along, amid many distractions, slowly towards completion. [53] Meanwhile, a long letter was written to Honoratus, in which a section on the grace of the New Testament was incorporated. At length the promised supplement was completed. It was professedly a criticism of Pelagius' Commentary, and therefore naturally mentioned his name; but Augustin even goes out of his way to speak as highly of his opponent as he can, [54] --although it is apparent that his esteem is not very high for his strength of mind, and is even less high for the moral quality that led to his odd, oblique way of expressing his opinions. There is even a half sarcasm in the way he speaks of Pelagius' care and circumspection, which was certainly justified by the event. The letter opens by stating and criticising in a very acute and telling dialectic, the new arguments of Pelagius, which were such as the following: "If Adam's sin injured even those who do not sin, Christ's righteousness ought likewise to profit even those who do not believe" (2-4); "No man can transmit what he has not; and hence, if baptism cleanses from sin, the children of baptized parents ought to be free from sin;" "God remits one's own sins, and can scarcely, therefore, impute another's to us; and if the soul is created, it would certainly be unjust to impute Adam's alien sin to it" (5). The stress of the letter, however, is laid upon two contentions,--1. That whatever else may be ambiguous in the Scriptures, they are perfectly clear that no man can have eternal life except in Christ, who came to call sinners to repentance (7); and 2. That original sin in infants has always been, in the Church, one of the fixed facts, to be used as a basis of argument, in order to reach the truth in other matters, and has never itself been called in question before (10-14). At this point, the writer returns to the second and third of the new arguments of Pelagius mentioned above, and discusses them more fully (15-20), closing with a recapitulation of the three great points that had been raised; viz., that both death and sin are derived from Adam's sin by all his posterity; that infants need salvation, and hence baptism; and that no man ever attains in this life such a state of holiness that he cannot truly pray, "Forgive us our trespasses."
Augustin was now to learn that one service often entails another. Marcellinus wrote to say that he was puzzled by what had been said in the second book of this work, as to the possibility of man's attaining to sinlessness in this life, while yet it was asserted that no man ever had attained, or ever would attain, it. How, he asked, can that be said to be possible which is, and which will remain, unexampled? In reply, Augustin wrote, during this same year (412), and sent to his noble friend, another work, which he calls On the Spirit and the Letter, from the prominence which he gives in it to the words of 2 Cor. iii. 6. [55] He did not content himself with a simple, direct answer to Marcellinus' question, but goes at length into a profound disquisition into the roots of the doctrine, and thus gives us, not a mere explanation of a former contention, but a new treatise on a new subject,--the absolute necessity of the grace of God for any good living. He begins by explaining to Marcellinus that he has affirmed the possibility while denying the actuality of a sinless life, on the ground that all things are possible to God,--even the passage of a camel through the eye of a needle, which nevertheless has never occurred (1, 2). For, in speaking of man's perfection, we are speaking really of a work of God,--and one which is none the less His work because it is wrought through the instrumentality of man, and in the use of his free will. The Scriptures, indeed, teach that no man lives without sin, but this is only the proclamation of a matter of fact; and although it is thus contrary to fact and Scripture to assert that men may be found that live sinlessly, yet such an assertion would not be fatal heresy. What is unbearable, is that men should assert it to be possible for man, unaided by God, to attain this perfection. This is to speak against the grace of God: it is to put in man's power what is only possible to the almighty grace of God (3, 4). No doubt, even these men do not, in so many words, exclude the aid of grace in perfecting human life,--they affirm God's help; but they make it consist in His gift to man of a perfectly free will, and in His addition to this of commandments and teachings which make known to him what he is to seek and what to avoid, and so enable him to direct his free will to what is good. What, however, does such a "grace" amount to? (5). Man needs something more than to know the right way: he needs to love it, or he will not walk in it; and all mere teaching, which can do nothing more than bring us knowledge of what we ought to do, is but the letter that killeth. What we need is some inward, Spirit-given aid to the keeping of what by the law we know ought to be kept. Mere knowledge slays: while to lead a holy life is the gift of God,--not only because He has given us will, nor only because He has taught us the right way, but because by the Holy Spirit He sheds love abroad in the hearts of all those whom He has predestinated, and will call and justify and glorify (Rom. viii. 29, 30). To prove this, he states to be the object of the present treatise; and after investigating the meaning of 2 Cor. iii. 6, and showing that "the letter" there means the law as a system of precepts, which reveals sin rather than takes it away, points out the way rather than gives strength to walk in it, and therefore slays the soul by shutting it up under sin,--while "the Spirit" is God's Holy Ghost who is shed abroad in our hearts to give us strength to walk aright,--he undertakes to prove this position from the teachings of the Epistle to the Romans at large. This contention, it will be seen, cut at the very roots of Pelagianism: if all mere teaching slays the soul, as Paul asserts, then all that what they called "grace" could, when alone, do, was to destroy; and the upshot of "helping" man by simply giving him free will, and pointing out the way to him, would be the loss of the whole race. Not that the law is sin: Augustin teaches that it is holy and good, and God's instrument in salvation. Not that free will is done away: it is by free will that men are led into holiness. But the purpose of the law (he teaches) is to make men so feel their lost estate as to seek the help by which alone they may be saved; and will is only then liberated to do good when grace has made it free. "What the law of works enjoins by menace, that the law of faith secures by faith. What the law of works does is to say, Do what I command thee;' but by the law of faith we say to God, Give me what thou commandest.'"(22). [56] In the midst of this argument, Augustin is led to discuss the differentiating characteristics of the Old and New Testaments; and he expounds at length (33-42) the passage in Jer. xxxi. 31-34, showing that, in the prophet's view, the difference between the two covenants is that in the Old, the law is an external thing written on stones; while in the New, it is written internally on the heart, so that men now wish to do what the law prescribes. This writing on the heart is nothing else, he explains, than the shedding abroad by the Holy Spirit of love in our hearts, so that we love God's will, and therefore freely do it. Towards the end of the treatise (50-61), he treats in an absorbingly interesting way of the mutual relations of free will, faith, and grace, contending that all co-exist without the voiding of any. It is by free will that we believe; but it is only as grace moves us, that we are able to use our free will for believing; and it is only after we are thus led by grace to believe, that we obtain all other goods. In prosecuting this analysis, Augustin is led to distinguish very sharply between the faculty and use of free will (58), as well as between ability and volition (53). Faith is an act of the man himself; but only as he is given the power from on high to will to believe, will he believe (57, 60).