Direct Quote by Immanuel Kant

A man's environment describes what goes on in his mind..

— Nana

A rational man is guided by his thinking - by a process of Reason - not by his feelings and desires.

— Ayn Rand

Man does not limit himself to seeing; he thinks and insists on learning the meaning of phenomena whose existence has been revealed to him…

— Claude Bernard

Reason is man's faculty for grasping the world by thought, in contradiction to intelligence, which is man's ability to manipulate the world with the…

— Erich Fromm

Man is a mixture of desires that extend beyond his knowledge and often result in action conflicting with rationality.

— Charles Lindbergh

A learned parson, rusting in his cell at Oxford or Cambridge, will reason admirably well upon the nature of man; will profoundly analyze the…

— Lord Chesterfield

Reason guides but a small part of man, and the rest obeys feeling, true or false, and passion, good or bad.

— Joseph Roux

Man acts from adequate motives relative to his interest, and not on metaphysical speculations.

— Edmund Burke

Does the human being reason? No; he thinks, muses, reflects, but does not reason...that is, in the two things which are the peculiar domain…

— Mark Twain

It is however always important to remember that the ability to see things in their correct perspective may be, and often is, divorced from…

— Joseph A. Schumpeter

Teach a man to reason and he will think for a lifetime.

— Phil Plait

A man for whom accident discovers sense, is not a rational being. A man only is so who understands, who distinguishes, who tests it.

— Francois de La Rochefoucauld