Logic

But, logic, like whiskey, loses its beneficial effect when taken in too large quantities. – Edward John Moreton Drax Plunkett Dunsany, "Weeds & Moss," My Irelan

Logic: The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding. – Ambrose Bierce

Reason means truth and those who are not governed by it take the chance that someday the sunken fact will rip the bottom out of their boat. – Oliver Wendell Holmes,Jr.

Logic is neither a science nor an art, but a dodge. – Benjamin Jowett

If you follow reason far enough it always leads to conclusions that are contrary to reason. – Samuel Butler

Truly, that reason upon which we plume ourselves, though it may answer for little things, yet for great decisions is hardly surer than a toss-up. – Charles Sanders Peirce

Logic is one thing and commonsense another. – Elbert Hubbard, The Note Book, 1927

Reason: The arithmetic of the emotions. – Elbert Hubbard, The Roycroft Dictionary

Pure logic is the ruin of the spirit. – Antoine de Saint-Exupéry, Flight to Arras, 1942, translated from French by

A mind all logic is like a knife all blade. – Rabindranath Tagore

Common sense, however it tries, cannot avoid being surprised from time to time. – Bertrand Russell

He is a true fugitive who flies from reason. – Marcus Aurelius

If the world were a logical place, men would ride side saddle. – Rita Mae Brown

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 with confidence. – Joseph Wood Krutch, The Modern Temper, 1929 (Thanks, Jeff)

A wise man is not governed by others, nor does he try to govern them; he prefers that reason alone prevail. – La Bruyère, Characters, 1688

The last function of reason is to recognize that there are an infinity of things which surpass it. – Blaise Pascal, Pensées, 1670

Logic is a large drawer, containing some useful instruments, and many more that are superfluous. A wise man will look into it for two purposes, to avail himself of those instruments that are really useful, and to admire the ingenuity with which those that are not so, are assorted and arranged. – Charles Caleb Colton, Lacon

Logic, n. The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding. – Ambrose Bierce

I cannot tell by what logic we call a toad, a bear, or an elephant ugly; they being created in those outward shapes and figures which best express the actions of their inward forms. – Sir Thomas Browne

Logic is like the sword – Samuel Butler