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Updated: June 11, 2025


The other instance which I shall quote is a truly astonishing one, and may be called the reductio ad absurdum of the theory of inconceivableness. Speaking of the laws of chemical composition, Dr.

If our incapacity to conceive the negation of a given supposition is proof of its truth, because proving that our experience has hitherto been uniform in its favor, the real evidence for the supposition is not the inconceivableness, but the uniformity of experience. Now this, which is the substantial and only proof, is directly accessible.

Of those who still adhere to the old opinions we need not speak; but when one of the most vigorous as well as boldest thinkers that English speculation has yet produced, full of the true scientific spirit, Mr Herbert Spencer, places in the front of his philosophy the doctrine that the ultimate test of the truth of a proposition is the inconceivableness of its negative; when, following in the steps of Mr Spencer, an able expounder of positive philosophy like Mr Lewes, in his meritorious and by no means superficial work on Aristotle, after laying, very justly, the blame of almost every error of the ancient thinkers on their neglecting to verify their opinions, announces that there are two kinds of verification, the Real and the Ideal, the ideal test of truth being that its negative is unthinkable, and by the application of that test judges that gravitation must be universal even in the stellar regions, because in the absence of proof to the contrary, "the idea of matter without gravity is unthinkable;" when those from whom it was least to be expected thus set up acquired necessities of thought in the minds of one or two generations as evidence of real necessities in the universe, we must admit that the metaphysical mode of thought still rules the higher philosophy, even in the department of inorganic nature, and far more in all that relates to man as a moral, intellectual, and social being.

In this wide range of cases subjective inconceivableness must correspond to objective impossibility. Further experience will produce correspondence where it may not yet exist; and we may expect the correspondence to become ultimately complete.

Spencer’s doctrine, therefore, does not erect the curable, but only the incurable limitations of the human conceptive faculty, into laws of the outward universe. The doctrine, that “a belief which is proved by the inconceivableness of its negation to invariably exist, is true,” Mr. Spencer enforces by two arguments, one of which may be distinguished as positive, and the other as negative.

The belief therefore is not invariable; and the test of inconceivableness fails in the only cases to which there could ever be any occasion to apply it.

But they fancied these phenomena to be produced by a hidden machinery which they did not see, because without it they were unable to conceive what they did see. The inconceivableness, instead of representing their experience, dominated and overrode their experience. Without dwelling further on what I have termed the positive argument of Mr.

Sotillo's temperament was of that sort that he experienced an ardent desire to beat him; just as formerly when negotiating with difficulty a loan from the cautious Anzani, his fingers always itched to take the shopkeeper by the throat. As to Captain Mitchell, the suddenness, unexpectedness, and general inconceivableness of this experience had confused his thoughts.

Hence, as being taken for granted in every act of the understanding, it must be regarded as the Universal Postulate.” But as this postulate, which we are under aninexorable necessityof holding true, is sometimes false; asbeliefs that once were shown by the inconceivableness of their negations to invariably exist, have since been found untrue,” and asbeliefs that now possess this character may some day share the same fate;” the canon of belief laid down by Mr.

An unfair way which some men take with themselves, who, because of the inconceivableness of something they find in one, throw themselves violently into the contrary hypothesis, though altogether as unintelligible to an unbiassed understanding."

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