A well regulated mind sees all things as they should be seen, appraises them at their proper value, turns them to its own advantage, and adheres firmly to its own opinions as it knows all their force and weight.
A difference exists between a working mind and a business-like mind. We can undertake business without turning it to our own interest.
 François de La Rochefoucauld, Reflections; or Sentences and Moral Maxims (1665). copy citation

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Author François de La Rochefoucauld
Source Reflections; or Sentences and Moral Maxims
Topic value difference
Date 1665
Language English
Reference
Note Translated by J. W. Willis Bund
Weblink http://www.gutenberg.org/files/9105/9105-h/9105-h.htm

Context

“A clever, pliant, winning mind knows how to avoid and overcome difficulties. Bending easily to what it wants, it understands the inclination and temper it is dealing with, and by managing their interests it advances and establishes its own. A well regulated mind sees all things as they should be seen, appraises them at their proper value, turns them to its own advantage, and adheres firmly to its own opinions as it knows all their force and weight. A difference exists between a working mind and a business-like mind. We can undertake business without turning it to our own interest. Some are clever only in what does not concern them, and the reverse in all that does. There are others again whose cleverness is limited to their own business, and who know how to turn everything to their own advantage.” source