Quotes About Logic

From principles is derived probability, but truth or certainty is obtained only from facts.

Moral truth, resting entirely upon the ascertained consequences of actions, supposes a process of observation and reasoning.

[Science is] the literature of truth.

An idea is a putting truth in check-mate.

There is a certain way of searching for the truth in mathematics that Plato is said first to have discovered. Theon called this analysis.

The truth of a proposition has nothing to do with its credibility. And vice versa.

Truth [comes only] from those ... who cultivate their reason.

...logical validity is not a guarantee of truth.

Thus each truth discovered was a rule available in the discovery of subsequent ones.

Antithesis may be the blossom of wit, but it will never arrive at maturity unless sound sense be the trunk and truth the root.

To know, to get into the truth of anything, is ever a mystic art, of which the best logic's can but babble on the surface.

Eliminate all other factors, and the one which remains must be the truth.

Two elements are needed to form a truth - a fact and an abstraction

Gentlemen, that is surely true, it is absolutely paradoxical; we cannot understand it, and we don't know what it means. But we have proved it, and therefore we know it must be the truth.

The facts, if they are there, speak for themselves.

A man is to be cheated into passion, but to be reasoned into truth.

The truth of it is that women are far more logical than men.

It takes at least three trees to make a row, and it needs at least three facts to make a truth.

The qualities of number appear to lead to the apprehension of truth.

One finds the truth by making a hypothesis and comparing observations with the hypothesis.

Life is a paradox. Every truth has its counterpart which contradicts it; and every philosopher supplies the logic his own undoing.

The entire method consists in the order and arrangement of the things to which the mind's eye must turn so that we can discover some truth.

We do not know a truth without knowing its cause.

Logic is essentially a tool for getting at truth; it is the tool, for without it no reasoning is possible in any field of human enquiry whatsoever.