Logic Quotes

1313 quotes by 899 authors

Frege has the merit of ... finding a third assertion by recognising the world of logic which is neither mental nor physical. — Bertrand Russell
I end with a word on the new symbols which I have employed. Most writers on logic strongly object to all symbols. ... I should… — Augustus De Morgan
If you plan it out, and it seems logical to you, then you can do it. I discovered the power of a plan. — Robert Ballard
In every enterprise ... the mind is always reasoning, and, even when we seem to act without a motive, an instinctive logic still directs the… — Claude Bernard
It is evidently equally foolish to accept probable reasoning from a mathematician and to demand from a rhetorician demonstrative proofs. — Aristotle
It is time, therefore, to abandon the superstition that natural science cannot be regarded as logically respectable until philosophers have solved the problem of induction.… — A.J. Ayer
It must be granted that in every syllogism, considered as an argument to prove the conclusion, there is a petitio principii. When we say, All… — John Stuart Mill
It really is worth the trouble to invent a new symbol if we can thus remove not a few logical difficulties and ensure the rigour… — Gottlob Frege
Logic is a wonderful thing but doesn't always beat actual thought. — Terry Pratchett
Men are rather beholden ... generally to chance or anything else, than to logic, for the invention of arts and sciences. — Francis Bacon
Metaphysics may be, after all, only the art of being sure of something that is not so and logic only the art of going wrong… — Joseph Wood Krutch
SYLLOGISM, n. A logical formula consisting of a major and a minor assumption and an inconsequent. — Ambrose Bierce
The maxim is, that whatever can be affirmed (or denied) of a class, may be affirmed (or denied) of everything included in the class. This… — John Stuart Mill
The strength of the computer lies in its being a logic machine. It does precisely what it is programed to do. This makes it fast… — Peter Drucker
The Syllogism consists of propositions, propositions consist of words, words are symbols of notions. Therefore if the notions themselves (which is the root of the… — Francis Bacon
There are very few theorems in advanced analysis which have been demonstrated in a logically tenable manner. Everywhere one finds this miserable way of concluding… — Niels Henrik Abel
[Aristotle formal logic thus far (1787)] has not been able to advance a single step, and hence is to all appearances closed and completed. — Immanuel Kant
The vast majority of human beings are not interested in reason or satisfied with what it teaches. — Aldous Huxley
Logic is one thing and commonsense another. — Elbert Hubbard
Logic is a poor guide compared with custom. — Winston Churchill

Who Wrote These Logic Quotes

899 authors contributed a total of 1,313 Logic Quotes, led by these top contributors: