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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
“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
“We cannot think anything unlogical, for otherwise we should have to think unlogically.” Ludwig Wittgenstein, Tractatus Logico-Philosophicus
“The logical picture of the facts is the thought.” 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, 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
“Insanity is often the logic of an accurate mind overtasked.” Oliver Wendell Holmes Sr., The Autocrat of the Breakfast-Table
“Logic is like the sword—those who appeal to it shall perish by it.” Samuel Butler, The Note-Books of Samuel Butler
“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
“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 solution of logical problems must be simple for they set the standard of simplicity.” Ludwig Wittgenstein, Tractatus Logico-Philosophicus
“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
“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
“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
“when you have eliminated the impossible whatever remains, however improbable, must be the truth” Arthur Conan Doyle, The Sign of the Four
“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
“You can prove anything you want by coldly logical reason—if you pick the proper postulates.” Isaac Asimov, I, Robot
“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
“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
“The living bird is not its labelled bones.” Margaret Atwood, The Blind Assassin
“Every proposition which we can understand must be composed wholly of constituents with which we are acquainted.” Bertrand Russell, The Problems of Philosophy
“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

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

Related authors

Ludwig Wittgenstein (5)
George Orwell (2)
Lewis Carroll (2)
Agatha Christie (2)
Oliver Wendell Holmes Sr. (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)
Arthur Conan Doyle (1)
John Stuart Mill (1)
Alexis de Tocqueville (1)
Ambrose Bierce (1)
Edgar Allan Poe (1)
Frank Herbert (1)
Samuel Butler (1)

Related sources

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