"Ad" Quotes from Famous Books
 ... not form, but content: as form, it is nothing but intuition or aesthetic fact. History does not seek for laws nor form concepts; it employs neither induction nor deduction; it is directed ad narrandum, non ad demonstrandum; it does not construct universals and abstractions, but posits intuitions. The this, the that, the individuum omni modo determinatum, is its kingdom, as it is the kingdom of art. History, therefore, is ...
— Aesthetic as Science of Expression and General Linguistic • Benedetto Croce
... multitude and indignity of authors in his time; and the famed preacher, Geyler von Kaisersberg, in the age of prevalent monkery and Benedictine plodding, mentioned erudition and madness, on equal footing, as the twin results of books: "Libri quosdam ad scientiam, quosdam ad insaniam deduxere." These were successive symptoms of the growing malady. But where there was one writer in the time of Geyler, there are a million now. He saw both health and disease, and could distinguish between them. We ...
— The Atlantic Monthly, Volume 14, No. 83, September, 1864 • Various
... perfectly logical. In these discussions we cannot hope to drive an unsound theory to a logical contradiction. A reasoner, apart from mere slips, only involves himself in a contradiction when he is shying at a reductio ad absurdum. The substantial reason for rejecting a philosophical theory is the 'absurdum' to which it reduces us. In the case of the philosophy of natural science the 'absurdum' can only be that our perceptual knowledge has not the character ...
— The Concept of Nature - The Tarner Lectures Delivered in Trinity College, November 1919 • Alfred North Whitehead
... joy of giving was rapidly growing to a vice. "Here's something for them," she added, nodding towards his fellows, and a second shilling came from her pocket. "Just as you say, yer leddyship," he said with owlish gravity; "but for my part I think they've 'ad enough. I don't 'old with temptin' the weak passions ...
— The Judgment House • Gilbert Parker
... there: that the temperature of boiling water or of melting iron, for example, would exist in certain points of a hollow envelop of glass! In all the vast domain of the physical sciences, we should be unable to find a more striking application of the celebrated method of the reductio ad absurdum of which the ancient mathematicians made use, in order to demonstrate the abstract ...
— Biographies of Distinguished Scientific Men • Francois Arago
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