Contrast Quote by Edward Abbey

“Logic may be conceived as ruling out what is absolutely impossible, and thus determining the field of what in the absence of empirical knowledge…

— Morris F. Cohen

“Truths are known to us in two ways: some are known directly, and of themselves; some through the medium of other truths. The former…

— John Stuart Mill

The primary use of knowledge is for such guidance of conduct under all circumstances as shall make living complete. All other uses of knowledge…

— Herbert Spencer

Logic is the foundation of the certainty of all the knowledge we acquire.

— Leonhard Euler

All possible knowledge, then, depends on the validity of reasoning...Unless human reasoning is valid no science can be true.

— Anonymous

“Logic is the science not of external forms of thought, but of the laws of development "of all material, natural and spiritual things", i.e.,…

— Vladimir Ilyich Lenin

What is all Knowledge too but recorded Experience, and a product of History; of which, therefore, Reasoning and Belief, no less than Action and…

— Thomas Carlyle

For, strictly considered, what is all Knowledge too but recorded Experience, and a product of History; of which, therefore, Reasoning and Belief, no less…

— Thomas Carlyle

The implications of these considerations justify the statement that all empirically verifiable knowledge even the commonsense knowledge of everyday life - involves implicitly, if…

— Talcott Parsons

Logic is not only an exact science, but is the most simple and elementary of all sciences; it ought therefore undoubtedly to find some…

— William Stanley Jevons

Inductive inference is the only process known to us by which essentially new knowledge comes into the world.

— Ronald Fisher

Logic is a large drawer, containing some useful instruments, and many more that are superfluous. A wise man will look into it for two…

— Charles Caleb Colton