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logic quotes

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“But all propositions of logic say the same thing. That is, nothing.” Ludwig Wittgenstein, Tractatus Logico-Philosophicus
“The employment of the word Logic to denote the theory of Argumentation, is derived from the Aristotelian, or, as they are commonly termed, the scholastic, logicians.” John Stuart Mill, A System Of Logic, Ratiocinative And Inductive
“Logic is like the sword—those who appeal to it shall perish by it.” Samuel Butler, The Note-Books of Samuel Butler
“In a certain sense we cannot make mistakes in logic.” Ludwig Wittgenstein, Tractatus Logico-Philosophicus
“Contrariwise . . . if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.” Lewis Carroll, Through the Looking-Glass
“Deep in the human unconscious is a pervasive need for a logical universe that makes sense. But the real universe is always one step beyond logic.” Frank Herbert, Dune
“LOGIC, n. The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding.” Ambrose Bierce, The Devil's Dictionary
“Love life . . . regardless of logic, and it’s only then one will understand the meaning of it.” Fyodor Dostoyevsky, The Brothers Karamazov
“You can hire logic, in the shape of a lawyer, to prove anything that you want to prove.” Oliver Wendell Holmes Sr., The Autocrat of the Breakfast-Table
“Histories make men wise; poets witty; the mathematics subtile; natural philosophy deep; moral grave; logic and rhetoric able to contend.” Francis Bacon, The Essays of Francis Bacon
“The poet only asks to get his head into the heavens. It is the logician who seeks to get the heavens into his head. And it is his head that splits.” G. K. Chesterton, Orthodoxy
“Insanity is often the logic of an accurate mind overtasked.” Oliver Wendell Holmes Sr., The Autocrat of the Breakfast-Table
“We cannot think anything unlogical, for otherwise we should have to think unlogically.” Ludwig Wittgenstein, Tractatus Logico-Philosophicus
“It is always easy to be logical. It is almost impossible to be logical to the bitter end.” Albert Camus, The Myth of Sisyphus
“The logical picture of the facts is the thought.” Ludwig Wittgenstein, Tractatus Logico-Philosophicus
“The solution of logical problems must be simple for they set the standard of simplicity.” Ludwig Wittgenstein, Tractatus Logico-Philosophicus
“You can prove anything you want by coldly logical reason—if you pick the proper postulates.” Isaac Asimov, I, Robot
“The mass of the people regard as profound only him who suggests pungent contradictions of the general idea. In ratiocination, not less than in literature, it is the epigram which is the most immediately and the most universally appreciated. In...” Edgar Allan Poe, The Mystery of Marie Rogêt
“when you have eliminated the impossible whatever remains, however improbable, must be the truth” Arthur Conan Doyle, The Sign of the Four
“The living bird is not its labelled bones.” Margaret Atwood, The Blind Assassin
“In philosophy, or religion, or ethics, or politics, two and two might make five, but when one was designing a gun or an aeroplane they had to make four. Inefficient nations were always conquered sooner or later, and the struggle for efficiency...” George Orwell, 1984
“One of the most ordinary weaknesses of the human intellect is to seek to reconcile contrary principles, and to purchase peace at the expense of logic.” Alexis de Tocqueville, Democracy in America
“Every proposition which we can understand must be composed wholly of constituents with which we are acquainted.” Bertrand Russell, The Problems of Philosophy
“You say: I am not free. But I have lifted my hand and let it fall. Everyone understands that this illogical reply is an irrefutable demonstration of freedom.” Leo Tolstoy, War and Peace
“I am not keeping back facts. Every fact that I know is in your possession. You can draw your own deductions from them.” Agatha Christie, The Mysterious Affair at Styles
“Can you do Division? Divide a loaf by a knife—what's the answer to that? . . . Bread-and-butter, of course.” Lewis Carroll, Through the Looking-Glass
“love is many things, none of them logical.” William Goldman, The Princess Bride
“Everything must be taken into account. If the fact will not fit the theory—let the theory go.” Agatha Christie, The Mysterious Affair at Styles
“For, after all, how do we know that two and two make four? Or that the force of gravity works? Or that the past is unchangeable? If both the past and the external world exist only in the mind, and if the mind itself is controllable what then?” George Orwell, 1984

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mind science thinking philosophy poetry facts theory proof picture love life knowledge truth wisdom freedom reality understanding action thought meaning

Related authors

Ludwig Wittgenstein (5)
George Orwell (2)
Lewis Carroll (2)
Oliver Wendell Holmes Sr. (2)
Agatha Christie (2)
Albert Camus (1)
Fyodor Dostoyevsky (1)
Leo Tolstoy (1)
Bertrand Russell (1)
Isaac Asimov (1)
Francis Bacon (1)
Margaret Atwood (1)
G. K. Chesterton (1)
John Stuart Mill (1)
Arthur Conan Doyle (1)
Alexis de Tocqueville (1)
Edgar Allan Poe (1)
Samuel Butler (1)
Ambrose Bierce (1)
Frank Herbert (1)

Related sources

Tractatus Logico-Philosophicus (5)
1984 (2)
The Autocrat of the Breakfast-Table (2)
Through the Looking-Glass (2)
The Mysterious Affair at Styles (2)
The Brothers Karamazov (1)
The Myth of Sisyphus (1)
The Essays of Francis Bacon (1)
The Blind Assassin (1)
War and Peace (1)
Democracy in America (1)
The Note-Books of Samuel Butler (1)
Dune (1)
Orthodoxy (1)
The Problems of Philosophy (1)
The Sign of the Four (1)
The Devil's Dictionary (1)
The Princess Bride (1)
I, Robot (1)
A System Of Logic, Ratiocinative And Inductive (1)