An Essay in Aid of a Grammar of Assent

by John Henry Newman

None of these questions, as they come before him, admit of simple demonstration; but each carries with it a number of independent probable arguments, sufficient, when united, for a reasonable conclusion about itself. And first he determines that the questions are such as he personally, with such talents or attainments as he has, may fairly entertain; and then he goes on, after deliberation, to form a definite judgment upon them; and determines them, one way or another, in their bearing on the bald syllogism which was originally offered to his acceptance. And, we will say, he comes to the conclusion, that he ought to accept it as true in his case; that he is a Protestant in such a sense, of such a complexion, of such knowledge, under such circumstances, as to be called upon by duty to join the Church; that this is a conclusion of which he can be certain, and ought to be certain, and that he will be incurring grave responsibility, if he does not accept it as certain, and act upon the certainty of it. And to this conclusion he comes, as is plain, not by any possible verbal enumeration of all the considerations, minute but abundant, delicate but effective, which unite to bring him to it; but by a mental comprehension of the whole case, and a discernment of its upshot, sometimes after much deliberation, [pg 292] but, it may be, by a clear and rapid act of the intellect, always, however, by an unwritten summing-up, something like the summation of the terms, plus and minus of an algebraical series.

This I conceive to be the real method of reasoning in concrete matters; and it has these characteristics:—First, it does not supersede the logical form of inference, but is one and the same with it; only it is no longer an abstraction, but carried out into the realities of life, its premisses being instinct with the substance and the momentum of that mass of probabilities, which, acting upon each other in correction and confirmation, carry it home definitely to the individual case, which is its original scope.

Next, from what has been said it is plain, that such a process of reasoning is more or less implicit, and without the direct and full advertence of the mind exercising it. As by the use of our eyesight we recognize two brothers, yet without being able to express what it is by which we distinguish them; as at first sight we perhaps confuse them together, but, on better knowledge, we see no likeness between them at all; as it requires an artist’s eye to determine what lines and shades make a countenance look young or old, amiable, thoughtful, angry or conceited, the principle of discrimination being in each case real, but implicit;—so is the mind unequal to a complete analysis of the motives which carry it on to a particular conclusion, and is swayed and determined by a body of proof, which it recognizes only as a body, and not in its constituent parts.

And thirdly, it is plain, that, in this investigation of [pg 293] the method of concrete inference, we have not advanced one step towards depriving inference of its conditional character; for it is still as dependent on premisses, as it is in its elementary idea. On the contrary, we have rather added to the obscurity of the problem; for a syllogism is at least a demonstration, when the premisses are granted, but a cumulation of probabilities, over and above their implicit character, will vary both in their number and their separate estimated value, according to the particular intellect which is employed upon it. It follows that what to one intellect is a proof is not so to another, and that the certainty of a proposition does properly consist in the certitude of the mind which contemplates it. And this of course may be said without prejudice to the objective truth or falsehood of propositions, since it does not follow that these propositions on the one hand are not true, and based on right reason, and those on the other not false, and based on false reason, because not all men discriminate them in the same way.

Having thus explained the view which I would take of reasoning in the concrete, viz. that, from the nature of the case, and from the constitution of the human mind, certitude is the result of arguments which, taken in the letter, and not in their full implicit sense, are but probabilities, I proceed to dwell on some instances and circumstances of a phenomenon which seems to me as undeniable as to many it may be perplexing.

1.

Let us take three instances belonging respectively to the present, the past, and the future.

1. We are all absolutely certain, beyond the possibility of doubt, that Great Britain is an island. We give to that proposition our deliberate and unconditional adhesion. There is no security on which we should be better content to stake our interests, our property, our welfare, than on the fact that we are living in an island. We have no fear of any geographical discovery which may reverse our belief. We should be amused or angry at the assertion, as a bad jest, did any one say that we were at this time joined to the main-land in Norway or in France, though a canal was cut across the isthmus. We are as little exposed to the misgiving, “Perhaps we are not on an island after all,” as to the question, “Is it quite certain that the angle in a semi-circle is a right-angle?” It is a simple and primary truth with us, if any truth is such; to believe it is as legitimate an exercise of assent, as there are legitimate exercises of doubt or of opinion. This is the position of our minds towards our insularity; yet are the arguments producible for it (to use the common expression) in black and white commensurate with this overpowering certitude about it?

Our reasons for believing that we are circumnavigable are such as these:—first, we have been so taught in our childhood, and it is so in all the maps; next, we have never heard it contradicted or questioned; on the contrary, [pg 295] every one whom we have heard speak on the subject of Great Britain, every book we have read, invariably took it for granted; our whole national history, the routine transactions and current events of the country, our social and commercial system, our political relations with foreigners, imply it in one way or another. Numberless facts, or what we consider facts, rest on the truth of it; no received fact rests on its being otherwise. If there is anywhere a junction between us and the continent, where is it? and how do we know it? is it in the north or in the south? There is a manifest reductio ad absurdum attached to the notion that we can be deceived on such a point as this.

However, negative arguments and circumstantial evidence are not all, in such a matter, which we have a right to require. They are not the highest kind of proof possible. Those who have circumnavigated the island have a right to be certain: have we ever ourselves even fallen in with any one who has? And as to the common belief, what is the proof that we are not all of us believing it on the credit of each other? And then, when it is said that every one believes it, and everything implies it, how much comes home to me personally of this “every one” and “everything”? The question is, Why do I believe it myself? A living statesman is said to have fancied Demerara an island; his belief was an impression; have we personally more than an impression, if we view the matter argumentatively, a lifelong impression about Great Britain, like the belief, so long and so widely entertained, that the earth was immovable, and the sun careered round it? I am not [pg 296] at all insinuating that we are not rational in our certitude; I only mean that we cannot analyze a proof satisfactorily, the result of which good sense actually guarantees to us.