WE may be wise to distrust our knowledge; and, unless we have tested them, to distrust what we may call our reasonings; but never to distrust reason itself. . . . That the powers with which the human reason must work are limited and are subject to faults and failures, our reason itself teaches us as soon as it begins to examine what we find around us and to endeavor to look in upon our own consciousness. But human reason is the only reason that men can have, and to assume that in so far as it can see clearly it does not see truly, is in the man who does it not only to assume the possession of a superior to human reason, but it is to deny the validity of all thought and to reduce the mental world to chaos.
— The Science of Political Economy —
Book III, Chapter 5, The Production of Wealth: Of Space and Time
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