“There is nothing so clever as people you agree with.”
Quoted by Helle Thorning-Schmidt on the occasion of Margrethe II's Ruby Jubilee. Speech http://kongehuset.dk/Menu/nyheder/statsministerens-tale-ved-gallataflet (15 January 2012)
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Margrethe II of Denmark 29
Queen of Denmark 1940Related quotes

“Cleverness is serviceable for everything, sufficient for nothing.”
16 February 1868
Journal Intime (1882), Journal entries
Context: Clever men will recognize and tolerate nothing but cleverness; every authority rouses their ridicule, every superstition amuses them, every convention moves them to contradiction. Only force finds favor in their eyes, and they have no toleration for anything that is not purely natural and spontaneous. And yet ten clever men are not worth one man of talent, nor ten men of talent worth one man of genius. And in the individual, feeling is more than cleverness, reason is worth as much as feeling, and conscience has it over reason. If, then, the clever man is not mockable, he may at least be neither loved, nor considered, nor esteemed. He may make himself feared, it is true, and force others to respect his independence; but this negative advantage, which is the result of a negative superiority, brings no happiness with it. Cleverness is serviceable for everything, sufficient for nothing.
“Agree with everything, explain nothing, then do what is best for you.”
Source: Why Men Love Bitches: From Doormat to Dreamgirl—A Woman's Guide to Holding Her Own in a Relationship

“I am not called Cugel the Clever for nothing.”
Source: Dying Earth (1950-1984), The Eyes of the Overworld (1966), Chapter 3, "The Mountains of Magnatz"

“The obstinancy of cleverness and reason is nothing to the obstinancy of folly and inanity.”
Source: Little Foxes (1865), Ch. 4.

“You are neither right nor wrong because people agree with you.”
As quoted by Warren Buffett, in an interview in Forbes magazine (1 November 1974)