“Both Barnum and H. L. Mencken are said to have made the depressing observation that no one ever lost money by underestimating the intelligence of the American public. The remark has worldwide application. But the lack is not in intelligence, which is in plentiful supply; rather, the scarce commodity is systematic training in critical thinking.”

“Nobody ever lost a dollar by underestimating the taste of the American public.”

“Many beautiful women have been made happy by their own beauty, but no intelligent woman has ever been made happy by her own intelligence.”

“[H]e is of the intelligentsia (which means he has been educated beyond his intelligence).”

“Man's greatest advances these last few generations have been made by the application of human intelligence to the management of matter. Now we are confronted by a more difficult problem, the application of intelligence to the management of human relations. Unless we can advance in that field also, the very instruments that man's intelligence has created may be the instruments of his destruction.”

“[H]e who has the most imagination should be regarded as having the most intelligence or genius, for all these words are synonymous…”

“The present moment is ever the critical time. The future is merely for intelligent forethought.”

“Through failures one becomes intelligent; but the one who has trained himself in this subject so that he can make others wise through their own failures, has used his intelligence. Ignorance is not stupidity.”

“She confused wit with intelligence, and made people laugh rather than lightening their hearts or making them think.”

“The open society is one in which men have learned to be to some extent critical of taboos, and to base decisions on the authority of their own intelligence.”