"The world little knows how many of the thoughts and theories which have passed through the mind of a scientific investigator, have been crushed in silence and secrecy by his own severe criticism and adverse examination!"

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We cannot doubt that self-interest is the mainspring of human nature. It must be clearly understood that this word is used here to designate a universal, incontestable fact, resulting from the nature of man, and not an adverse judgment, as would be the word selfishness.

— Frederic Bastiat