St. John Henry Newman
Grammar of Assent
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Belief in the Holy Trinity
Nor is this all: the disavowal of error is far more fruitful in additions than the enforcement of truth. There is another set of deductions, inevitable also, and also part or not part of the revealed credenda, according as we please to view them. If a proposition is true, its contradictory is false. If then a man believes that Christ is God, he believes also, and that necessarily, that to say He is not God is false, and that those who so say are in error. Here then again the prospect opens upon us of a countless multitude of propositions, which in their first elements are close upon devotional truth,—of groups of propositions, and those groups divergent, independent, ever springing into life with an inexhaustible fecundity, according to the ever-germinating forms of heresy, of which they are the antagonists. These too have their place in theological science.
Such is theology in contrast to religion; and as follows from the circumstances of its formation, though some of its statements easily find equivalents in the language of devotion, the greater number of them are more or less unintelligible to the ordinary Catholic, as law-books to the private citizen. And especially those portions of theology which are the indirect creation, not of orthodox, but of heretical thought, such as the repudiations of error contained in the Canons of Councils, of which specimens have been given above, will ever be foreign, strange, and hard to the pious but uncontroversial mind; for what have good Christians to do, in the ordinary course of things, with the subtle hallucinations of the intellect? This is manifest from the nature of the case; but then the question recurs, why should the refutations of heresy be our objects of faith? if no mind, theological or not, can believe what it cannot understand, in what sense can the Canons of Councils and other ecclesiastical determinations be included in those credenda which the Church presents to every Catholic as if apprehensible, and to which every Catholic gives his firm interior assent?
In solving this difficulty I wish it first observed, that, if it is the duty of the Church to act as "the pillar and ground of the Truth," she is manifestly obliged from time to time, and to the end of time, to denounce opinions incompatible with that truth, whenever able and subtle minds in her communion venture to publish such opinions. Suppose certain Bishops and priests at this day began to teach that Islamism or Buddhism was a direct and immediate revelation from God, she would be bound to use the authority which God has given her to declare that such a proposition will not stand with Christianity, and that those who hold it are none of hers; and she would be bound to impose such a declaration on that very knot of persons who had committed themselves to the novel proposition, in order that, if they would not recant, they might be separated from her communion, as they were separate from her faith. In such a case, her masses of population would either not hear of the controversy, or they would at once take part with her, and without effort take any test, which secured the exclusion of the innovators; and she on the other hand would feel that what is a rule for some Catholics must be a rule for all. Who is to draw the line between who are to acknowledge that rule, and who are not? It is plain, there cannot be two rules of faith in the same communion, or rather, as the case really would be, an endless variety of rules, coming into force according to the multiplication of heretical theories, and to the degrees of knowledge and varieties of sentiment in individual Catholics. There is but one rule of faith for all; and it would be a greater difficulty to allow of an uncertain rule of faith, than (if that was the alternative, as it is not), to impose upon uneducated minds a profession which they cannot understand.
But it is not the necessary result of unity of profession, nor is it the fact, that the Church imposes dogmatic statements on the interior assent of those who cannot apprehend them. The difficulty is removed by the dogma of the Church's infallibility, and of the consequent duty of "implicit faith" in her word. The "One Holy Catholic and Apostolic Church" is an article of the Creed, and an article, which, inclusive of her infallibility, all men, high and low, can easily master and accept with a real and operative assent. It stands in the place of all abstruse propositions in a Catholic's mind, for to believe in her word is virtually to believe in them all. Even what he cannot understand, at least he can believe to be true; and he believes it to be true because he believes in the Church.
The rationale of this provision for unlearned devotion is as follows:—It stands to reason that all of us, learned and unlearned, are bound to believe the whole revealed doctrine in all its parts and in all that it implies according as portion after portion is brought home to our consciousness as belonging to it; and it also stands to reason, that a doctrine, so deep and so various, as the revealed depositum of faith, cannot be brought home to us and made our own all at once. No mind, however large, however penetrating, can directly and fully by one act understand any one truth, however simple. What can be more intelligible than that "Alexander conquered Asia," or that "Veracity is a duty"? but what a multitude of propositions is included under either of these theses! still, if we profess either, we profess all that it includes. Thus, as regards the Catholic Creed, if we really believe that our Lord is God, we believe all that is meant by such a belief; or, else, we are not in earnest, when we profess to believe the proposition. In the act of believing it at all, we forthwith commit ourselves by anticipation to believe truths which at present we do not believe, because they have never come before us;—we limit henceforth the range of our private judgment in prospect by the conditions, whatever they are, of that dogma. Thus the Arians said that they believed in our Lord's divinity, but when they were pressed to confess His eternity, they denied it: thereby showing in fact that they never had believed in His divinity at all. In other words, a man who really believes in our Lord's proper divinity, believes implicitè in His eternity.
And so, in like manner, of the whole depositum of faith, or the revealed word:—If we believe in the revelation, we believe in what is revealed, in all that is revealed, however it may be brought home to us, by reasoning or in any other way. He who believes that Christ is the Truth, and that the Evangelists are truthful, believes all that He has said through them, though he has only read St. Matthew and has not read St. John. He who believes in the depositum of Revelation, believes in all the doctrines of the depositum; and since he cannot know them all at once, he knows some doctrines, and does not know others; he may know only the Creed, nay, perhaps only the chief portions of the Creed; but, whether he knows little or much, he has the intention of believing all that there is to believe whenever and as soon as it is brought home to him, if he believes in Revelation at all. All that he knows now as revealed, and all that he shall know, and all that there is to know, he embraces it all in his intention by one act of faith; otherwise, it is but an accident that he believes this or that, not because it is a revelation. This virtual, interpretative, or prospective belief is called a believing implicitè; and it follows from this, that, granting that the Canons of Councils and the other ecclesiastical documents and confessions, to which I have referred, are really involved in the depositum or revealed word, every Catholic, in accepting the depositum, does implicitè accept those dogmatic decisions.
Source: Grammar of Assent (Newman Reader)