The economy, stupid!

-Anonymous
  Sign in the Clinton campaign headquarters which became a by-word for the central issue of the1992 presidential campaign. Quoted in Fortune,19 Oct.

He has all the qualities that go to the making of a leader of the Conservative Party. He is not stupid, but he is very dull. He is not eloquent, but he talks well. He is not honest, politically, but he is most evangelical.He has a Beckett little money, but not much. He always conforms to the party policy.

-Baron
  Commenting on Sir Samuel Hoare's appointment as Foreign Secretary.

I am more stupid about some things than about others; not equally stupid in all directions; I am not a well- rounded person.

-Bellow, Saul
  Mr Sammler's Planet, ch.2.

The better the actor the more stupid he is.

-Capote,Truman
Attributed.

To be clever enough to get all that money, one must be stupid enough to want it.

-Chesterton, G(ilbert) K(eith)
  The Wisdom of Father Brown,'Paradise of  Thieves'.

Was man made stupid to see his own stupidity? Is God by definition indifferent, beyond us all? Is the eternal truth man's fighting soul Wherein the Beast ravens in its own avidity?

-Eberhart, Richard Ghormley
  'The Fury of  Aerial Bombardment'.

That man must be very much absorbed in reflection, or stupid, or sulky, or unhappy, or a mere hog at his trough, who is not moved to say something when he dines.

-Hunt, (James Henry) Leigh
Table-Talk,'Table- Talk'.

Only in Britain could it be thought a defect to be 'too clever by half'. The probability is that too many people are too stupid by three-quarters.

-Major,John
  Quoted in the Observer,7  Jul.

The more books one reads, the more stupid one becomes.

-Mao Zedong or MaoTse-tung
  Quoted in Ross Terrill Mao:  A Biography (1980), ch.22.

Whena stupid manisdoing something heisashamedof, he always declares that it is his duty.

-Shaw, George Bernard
  Apollodorus. Caesar and Cleopatra, act 3.

The man whose life is spent in performing a few simple operations of which the effects too are, perhaps, always the same or very nearly the same, has no occasion to exert his understanding, or to exercise his invention. He generally becomes asstupidand ignorant asit ispossible for a human creature to become.

-Smith, Adam
  An Inquiry into the Nature and Causes of theWealth of Nations, bk.5, ch.1, pt.3, article 2.

The great and almost onlycomfort about being a woman is that one can always pretend to be more stupid than one is and no one is surprised.

-Stark, Dame Freya Madeleine
  TheValley of theAssassins.

If someone was stupid enough to offer me a million dollars to make a pictureöI was certainly not dumb enough to turn it down.

-Taylor, Elizabeth Rosemond
Quoted in David Niven The Moon's a Balloon (1975).