Quotes about deduction

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Source: The Principles of Science: A Treatise on Logic and Scientific Method (1874) Vol. 1, p. 14

https://twitter.com/realDonaldTrump/status/802972944532209664, quoted in * 2019-03-19 The Dangerous Case of Donald Trump: 37 Psychiatrists and Mental Health Experts Assess a President Bandy X. Lee Thomas Dunne Books (St. Martin's Press) New York 1250212863
Ref: en.wikiquote.org - Donald Trump / Quotes / Donald Trump on social media / Twitter
2010s, 2016, November

Book III, lines 1087–1088 (tr. Rouse)
De Rerum Natura (On the Nature of Things)

Variant, from Preface to Max Planck's Where is Science Going? (1933): The supreme task of the physicist is the discovery of the most general elementary laws from which the world-picture can be deduced logically. But there is no logical way to the discovery of these elemental laws. There is only the way of intuition, which is helped by a feeling for the order lying behind the appearance, and this Einfühlung [literally, empathy or 'feeling one's way in']' is developed by experience.
1910s, Principles of Research (1918)
Context: The supreme task of the physicist is to arrive at those universal elementary laws from which the cosmos can be built up by pure deduction. There is no logical path to these laws; only intuition, resting on sympathetic understanding of experience, can reach them. In this methodological uncertainty, one might suppose that there were any number of possible systems of theoretical physics all equally well justified; and this opinion is no doubt correct, theoretically. But the development of physics has shown that at any given moment, out of all conceivable constructions, a single one has always proved itself decidedly superior to all the rest.

More Worlds Than One: The Creed of the Philosopher and the Hope of the Christian (1856), "Religious Difficulties", p. 152-153
Context: Amid the destructive convulsions of the physical world, even pious minds may have for an instant questioned the superintending providence of God. In the midst of famine, or pestilence, or war, they may have stood horror- struck at the scene. In the triumphs of fraud, oppression, and injustice, over honesty, and liberty, and law. Faith may have wavered, and Hope despaired; but in no condition, either of the physical or the moral world, does the mind question the POWER of its Maker. The omnipotence of the Creator, and the exertion of it in every corner of space, — His care over the falling sparrow, and His guidance of the gigantic planet, are the earliest of our acquired truths, and the very first that observation and experience confirm. When Reason gives wisdom to our perceptions, omnipotence is the grand truth which they inculcate. Whatever the eye sees, or the ear hears, or the fingers touch, — every motion of our body, every function it performs, every structure in its fabric, impresses on the mind, and fixes in the heart the conviction, that the Creator is all-powerful as well as all-wise. Omnipotence, in short, is the only attribute of God which is universally appreciated, which skepticism never unsettles, and which we believe as firmly when under the influence of our corrupt passions, as when we are looking devoutly to heaven. All the other attributes of God are inferences. His omnipresence, His omniscience, His justice, mercy, and truth, are the deductions of reason, and, however true and demonstrable, they exercise little influence over the mind; but the attribute of omnipotence predominates over them all, and no mind responsive to its power will ever be disturbed by the ideas which it suggests of infinity of time, infinity of space, and infinity of life.

The Saviors of God (1923)
Context: I do not care what face other ages and other people have given to the enormous, faceless essence. They have crammed it with human virtues, with rewards and punishments, with certain ties. They have given a face to their hopes and fears, they have submitted their anarchy to a rhythm, they have found a higher justification by which to live and labor. They have fulfilled their duty.
But today we have gone beyond these needs; we have shattered this particular mask of the Abyss; our God no longer fits under the old features.
Our hearts have overbrimmed with new agonies, with new luster and silence. The mystery has grown savage, and God has grown greater. The dark powers ascend, for they have also grown greater, and the entire human island quakes.
Let us stoop down to our hearts and confront the Abyss valiantly. Let us try to mold once more, with our flesh and blood, the new, contemporary face of God.
For our God is not an abstract thought, a logical necessity, a high and harmonious structure made of deductions and speculations.
He is not an immaculate, neutral, odorless, distilled product of our brains, neither male nor female.
He is both man and woman, mortal and immortal, dung and spirit. He gives birth, fecundates, slaughters — death and eros in one — and then he begets and slays once more, dancing spaciously beyond the boundaries of a logic which cannot contain the antinomies.

The Magic of Images: Word and Picture in a Media Age (2004)
Context: The computer, with its multiplying forums for spontaneous free expression from e-mail to listservs and blogs, has increased facility and fluency of language but degraded sensitivity to the individual word and reduced respect for organized argument, the process of deductive reasoning. The jump and jitter of us commercial television have demonstrably reduced attention span in the young.

Source: Kafka on the Shore (2002), Chapter 17, Oshima

1780s, Speech at the Virginia Convention (1788)
Context: With respect to that part of the proposal which says that every power not granted remains with the people, it must be previous to adoption, or it will involve this country in inevitable destruction. To talk of it as a thing subsequent, not as one of your unalienable rights, is leaving it to the casual opinion of the Congress who shall take up the consideration of that matter. They will not reason with you about the effect of this Constitution. They will not take the opinion of this committee concerning its operation. They will construe it as they please. If you place it subsequently, let me ask the consequences. Among ten thousand implied powers which they may assume, they may, if we be engaged in war, liberate every one of your slaves if they please. And this must and will be done by men, a majority of whom have not a common interest with you. They will, therefore, have no feeling of your interests. It has been repeatedly said here, that the great object of a national government was national defence. That power which is said to be intended for security and safety may be rendered detestable and oppressive. If they give power to the general government to provide for the general defence, the means must be commensurate to the end. All the means in the possession of the people must be given to the government which is intrusted with the public defence. In this state there are two hundred and thirty-six thousand blacks, and there are many in several other states. But there are few or none in the Northern States; and yet, if the Northern States shall be of opinion that our slaves are numberless, they may call forth every national resource. May Congress not say, that every black man must fight? Did we not see a little of this last war? We were not so hard pushed as to make emancipation general; but acts of Assembly passed that every slave who would go to the army should be free. Another thing will contribute to bring this event about. Slavery is detested. We feel its fatal effects—we deplore it with all the pity of humanity. Let all these considerations, at some future period, press with full force on the minds of Congress. Let that urbanity, which I trust will distinguish America, and the necessity of national defence,—let all these things operate on their minds; they will search that paper, and see if they have power of manumission. And have they not, sir? Have they not power to provide for the general defence and welfare? May they not think that these call for the abolition of slavery? May they not pronounce all slaves free, and will they not be warranted by that power? This is no ambiguous implication or logical deduction. The paper speaks to the point: they have the power in clear, unequivocal terms, and will clearly and certainly exercise it. As much as I deplore slavery, I see that prudence forbids its abolition. I deny that the general government ought to set them free, because a decided majority of the states have not the ties of sympathy and fellow-feeling for those whose interest would be affected by their emancipation. The majority of Congress is to the north, and the slaves are to the south.

Earth, Inc. (1973) In this passage, Fuller begins to explain why technological progress seems to make great gains in war time and states his view that this is a reflection of advances mainly made in peacetime — wars simply force nations to take notice of their advances in the pure science and then they apply those advances to the war effort. Later in the book Fuller will explain why he thinks war is not necessary to bring advances in the pure sciences into actual production. He uses this to advance the notion that humans can very comfortably live at a high standard of living by "doing more with less."
1970s
Context: It seems to demonstrate that periods of industrial activity in technical syntheses of principles, data, free energy and energy as "matter," find highest employment by the fear-amassed credits of warfare. Therefore the assumption approaches fact that war promotes the major technical advances of civilization... What has not been clear is that the potential of this emergency-born technology has always accrued to human's prewar individual initiatives taken in a humble but irrepressible progression of assumptions, measurements, deductions, and codifications of pure science. (1947)

Source: Science and Hypothesis (1901), Ch. I: On the Nature of Mathematical Reasoning (1905) Tr. https://books.google.com/books?id=5nQSAAAAYAAJ George Bruce Halstead
Context: The very possibility of the science of mathematics seems an insoluble contradiction. If this science is deductive only in appearance, whence does it derive that perfect rigor no one dreams of doubting? If, on the contrary, all the propositions it enunciates can be deduced one from another by the rules of formal logic, why is not mathematics reduced to an immense tautology? The syllogism can teach us nothing essentially new, and, if everything is to spring from the principle of identity, everything should be capable of being reduced to it. Shall we then admit that the enunciations of all those theorems which fill so many volumes are nothing but devious ways of saying A is A!... Does the mathematical method proceed from particular to the general, and, if so, how can it be called deductive?... If we refuse to admit these consequences, it must be conceded that mathematical reasoning has of itself a sort of creative virtue and consequently differs from a syllogism.<!--pp.5-6

Modern Manners (1983)

Science and the Unseen World (1929)

On his years of research in developing the electric light bulb, as quoted in "Talks with Edison" by George Parsons Lathrop in Harper's magazine, Vol. 80 (February 1890), p. 425.
Variant:
Through all the years of experimenting and research, I never once made a discovery. I start where the last man left off. … All my work was deductive, and the results I achieved were those of invention pure and simple.
As quoted in Makers of the Modern World : The Lives of Ninety-two Writers, Artists, Scientists, Statesmen, Inventors, Philosophers, Composers, and Other Creators who Formed the Pattern of Our Century (1955) by Louis Untermeyer, p. 227.
1800s

1990s, Ayodhya and After: Issues Before Hindu Society (1991)

This was the method followed by Euclid, who, fortunately for us, never dreamed of a geometry of triangles, as distinguished from a geometry of circles, or a separate application of the arithmetics of addition and subtraction; but made one help out the other as he best could.
The Differential and Integral Calculus (1836)

The Light of the Soul: Its Science and Effect: a paraphrase of the Yoga Sutras of Patanjali, with commentary by Alice A. Bailey, (1927)

Source: The Light of the Soul: Its Science and Effect: a paraphrase of the Yoga Sutras of Patanjali, with commentary (1927)

Original: (fr) La génération spontanée, je la cherche sans la découvrir depuis vingt ans. Non, je ne la juge pas impossible. Mais quoi donc vous autorise à vouloir qu'elle ait été l'origine de la vie? Vous placez la matière avant la vie et vous faites la matière existante de toute éternité. Qui vous dit que, le progrès incessant de la science n'obligera pas les savants, qui vivront dans un siècle, dans mille ans, dans dix mille ans... à affirmer que la vie a été de toute éternité et non la matière.? Vous passez de la matière à la vie parce que votre intelligence actuelle, si bornée par rapport à ce que sera l'intelligence des naturalistes futurs, vous dit qu'elle ne peut comprendre autrement les choses. Qui m'assure que dans dix mille ans on ne considérera pas que c'est de la vie qu'on croira impossible de ne pas passer à la matière? Si vous voulez être au nombre des esprits scientifiques, s, qui seuls comptent, il faut vous débarrasser des idées et des raisonnements a priori et vous en tenir aux déductions nécessaires des faits établis et ne pas accorder plus de confiance qu'il ne faut aux déductions de pures hypothèses."

As quoted in Pasteur et la philosophie (2004), by Patrice Pinet, p. 63

Partially quoted in Louis Pasteur : Free Lance of Science (1950) by René Dubos, p 396

Source: Kesrick (1982), Chapter 16, “The Fairy of the Fountain” (p. 105)