“A little folly is desirable in him that will not be guilty of stupidity.”
Book III, Ch. 9. Of Vanity
Essais (1595), Bartlett's Familiar Quotations, 10th ed. (1919)
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Michel De Montaigne 264
(1533-1592) French-Occitan author, humanistic philosopher, … 1533–1592Related quotes

But is there less in the people of rank who live in so strange a forgetfulness of their natural condition?
Discourses on the Condition of the Great

Graduation Exercises at the United States Military Academy at West Point, New York, U.S. (3 June 1947) http://www.eisenhower.archives.gov/all_about_ike/quotes.html
1940s
Context: War is mankind's most tragic and stupid folly; to seek or advise its deliberate provocation is a black crime against all men. Though you follow the trade of the warrior, you do so in the spirit of Washington — not of Genghis Khan. For Americans, only threat to our way of life justifies resort to conflict.

“For what is there more hideous than avarice, more brutal than lust, more contemptible than cowardice, more base than stupidity and folly?”
Quid enim foedius auaritia, quid immanius libidine, quid contemptius timiditate, quid abiectius tarditate et stultitia dici potest?
Book I, section 51; (Translation by C.D. Yonge) http://books.google.com/books?id=AdAIAAAAQAAJ&q=%22For+what+is+there+more+hideous+than+avarice+more+brutal+than+lust+more+contemptible+than+cowardice+more+base+than+stupidity+and%22&pg=PA420#v=onepage
De Legibus (On the Laws)

“What little girls learn is not the desire for the other, but the desire to be desired.”
Source: The Beauty Myth (1991), Chapter 5 : 'Sex', p. 157
Context: The books and films they see survey from the young boy's point of view his first touch of a girl's thighs, his first glimpse of her breasts. The girls sit listening, absorbing, their familiar breasts estranged as if they were not part of their bodies, their thighs crossed self-consciously, learning how to leave their bodies and watch them from the outside. Since their bodies are seen from the point of view of strangeness and desire, it is no wonder that what should be familiar, felt to be whole, becomes estranged and divided into parts. What little girls learn is not the desire for the other, but the desire to be desired. Girls learn to watch their sex along with the boys; that takes up the space that should be devoted to finding out about what they are wanting, and reading and writing about it, seeking it and getting it.

Discourses on the Condition of the Great