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Logic Quotes

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Logic Quotes

“Logic is the subject that has helped me most in picking stocks, if only because it taught me to identify the peculiar illogic of Wall Street. Actually Wall Street thinks just as the Greeks did. The early Greeks used to sit around for days and debate how many teeth a horse has. They thought they could figure it out just by sitting there, instead of checking the horse. A lot of investors sit around and debate whether a stock is going up, as if the financial muse will give them the answer, instead of checking the company.”

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Book:One Up On Wall Street: How To Use What You Already Know To Make Money In
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“Since reasoning , or inference, the principal subject of logic, is an operation which usually takes place by means of words , and in complicated cases can take place in no other way: those who have not a thorough insight into both the signification and purpose of words, will be under chances, amounting almost to certainty, of reasoning or inferring incorrectly.”

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Book:A System Of Logic, Ratiocinative And Inductive: Mill's Works
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“Rhetoric is the counterpart of logic; since both are conversant with subjects of such a nature as it is the business of all to have a certain knowledge of, and which belong to no distinct science. Wherefore all men in some way participate of both; since all, to a certain extent, attempt, as well to sift, as to maintain an argument; as well to defend themselves, as to impeach.”

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Book:Aristotle's Treatise on Rhetoric
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“In [Aristotle's] formal logic, thought is organized in a manner very different from that of the Platonic dialogue. In this formal logic, thought is indifferent toward its objects. Whether they are mental or physical, whether they pertain to society or to nature, they become subject to the same general laws of organization, calculation, and conclusion - but they do so as fungible signs or symbols, in abstraction from their particular "substance." This general quality (quantitative quality) is the precondition of law and order - in logic as well as in society - the price of universal control.”

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Author:Herbert Marcuse
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“The enthronement of Christ over the minds of men is steadily going forward. His kingdom embraces the princes in the realm of mind. It embraces the nations of highest civilization. They are all beneath the cross. It is maintained by simple authority. Other mental monarchs rule by logic; Christ's word is law--it is satisfying to His subjects. His truth in the hands of His disciples, like the bread He broke upon the mountains, is an ample supply for the millions that gather at His table.”

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Author:Edward Thomson
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“As far as I know, the question of whether and how it could be strategically or morally justified was never the subject of open debate in Germany after 1945, no doubt mainly because a nation which had murdered and worked to death millions of people in its camps could hardly call on the victorious powers to explain the military and political logic that dictated the destruction of the German cities.”

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Author:W. G. Sebald
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“Neither logic nor scientific evidence supports such a belief. Although spinal manipulation can relieve certain types of back pain, neck pain, and other musculoskeletal symptoms, there is no scientific evidence that it can restore or maintain health. As a result of expressing my opinion on this subject, I have been called a chiropractic heretic.”

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Book:Inside Chiropractic: A Patient's Guide
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“... while our men seem thoroughly abreast of the times on almost every other subject, when they strike the woman question they drop back into sixteenth century logic. They leave nothing to be desired generally in regard to gallantry and chivalry, but they actually do not seem sometimes to have outgrown that old contemporary of chivalry--the idea that women may stand on pedestals or live in doll houses,... but they must not furrow their brows with thought or attempt to help men tug at the great questions of the world.”

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Author:Anna Julia Cooper
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“The main thesis of mind-physics holds that consciousness and matter are both manifestations of a more primary entity, and that the processes of manifestation exhibit equivalent invariances for both consciousness and matter. When the program for mind-physics is complete the subject-object dichotomy of modal logic, the polarity of concept-percept, and the antagonism between morality and technology will all come to an end. Then the non-repeatable experiment will be understood to be more primary than the traditional repeatable experiment.”

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Author:Paul Laffoley
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“When I come upon anything-in Logic or in any other hard subject-that entirely puzzles me, I find it a capital plan to talk it over, aloud, even when I am all alone. One can explain things so clearly to one's self! And then, you know, one is so patient with one's self: one never gets irritated at one's own stupidity!”

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Book:Symbolic Logic: {Complete & Illustrated}
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“The validity of mathematical propositions is independent of the actual world-the world of existing subject-matters-is logically prior to it, and would remain unaffected were it to vanish from being. Mathematical propositions, if true, are eternal verities.”

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Book:The pastures of wonder: the realm of mathematics and the realm of science
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“If pressed to supplement Tweedledee's ostensive definition of logic with a discursive definition of the same subject, I would say that logic is the systematic study of the logical truths. Pressed further, I would say that a sentence is logically true if all sentences with its grammatical structure are true. Pressed further still, I would say to read this book.”

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Author:Willard Van Orman Quine
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