One can be a fool with much wit, and one need not be a fool even with very little wit.
 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 wit need
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

“there are tones and manners which make all the difference between phrases which seem all alike on paper, and yet express a different order of mind. So we say that a man has only one kind of wit, that he has several, that he has every variety of wit. One can be a fool with much wit, and one need not be a fool even with very little wit. To have much mind is a doubtful expression. It may mean every class of mind that can be mentioned, it may mean none in particular. It may mean that he talks sensibly while he acts foolishly. We may have a mind, but a narrow one.” source