Quotes about logic

Logic works, metaphysics contemplates.

Then I was in love with herself after all, said Diana, making one of those feminine leaps in logic that leave men breathless.

There are only two means by which men can deal with one another: guns or logic. Force or persuasion. Those who know that they cannot win by means of logic, have always resorted to guns.

It is impossible as I state it, and therefore I must in some respect have stated it wrong.

It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth.

I have already explained to you that what is out of the common is usually a guide rather than a hindrance. In solving a problem of this sort, the grand thing is to be able to reason backward. That is a very useful accomplishment, and a very easy one, but people do not practice it much. In the everyday affairs of life it is more useful to reason forward, and so the other comes to be neglected. There are fifty who can reason synthetically for one who can reason analytically.

Mathematics is not just a language. Mathematics is a language plus reasoning. It's like a language plus logic. Mathematics is a tool for reasoning. It's, in fact, a big collection of the results of some person's careful thought and reasoning. By mathematics, it is possible to connect one statement to another.

It is impossible, by the way, when picking one example of anything, to avoid picking one which is atypical in some sense.

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.

Anything outside yourself, this you can see and apply your logic to it. But it's a human trait that when we encounter personal problems, these things most deeply personal are the most difficult to bring out for our logic to scan. We tend to flounder around, blaming everything but the actual, deep-seated thing that's really chewing on us.

Dialectic, which is the parent of logic, came itself from rhetoric. Rhetoric is in turn the child of the myths and poetry of ancient Greece. That is so historically, and that is so by any application of common sense. The poetry and the myths are the response of a prehistoric people to the universe around them made on the basis of Quality. It is Quality, not dialectic, which is the generator of everything we know.

Ether is, in effect, a merely hypothetical entity, valuable only in so far as it explains that which by means of it we endeavor to explain — light, electricity, or universal gravitation — and only so far as these facts cannot be explained in any other way. In like manner the idea of God is also an hypothesis, valuable only in so far as it enables us to explain that which by means of it we endeavor to explain — the essence and existence of the Universe — and only so long as these cannot be explained in any other way. And since in reality we explain the Universe neither better nor worse with this idea than without it, the idea of God, the supreme petitio principii, is valueless.