„Don’t be smart. Smart is only a polished version of dumb. Try intelligence. It will surely see you through.“

— Terry Pratchett

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„Knowing a great deal is not the same as being smart; intelligence is not information alone but also judgement, the manner in which information is coordinated and used.“
— Carl Sagan
„What we think of as ‘Physical beauty’ is almost certainly a tag for a complex of useful survival characteristics. Smartness—intelligence—among them.“
— Robert A. Heinlein
„The entire evolutionary record on our planet, particularly the record contained in fossil endocasts, illustrates a progressive tendency toward intelligence. There is nothing mysterious about this: smart organisms by and large survive better and leave more offspring than stupid ones.“
— Carl Sagan
„To predict the behavior of ordinary people in advance, you only have to assume that they will always try to escape a disagreeable situation with the smallest possible expenditure of intelligence.“
— Friedrich Nietzsche
„I was not a[n intelligence] resident, only a Polish officer. I carried out my orders until arrested. I had no sense that I was a spy, and I ask that this be taken into account in deciding my verdict.“
— Witold Pilecki
„That’s the key to modern Britain … only the mentally castrated are eligible for praise and awards. It’s against the law to be intelligent! The dumb have inherited the earth. Because of this, British arts are controlled by completely limited possibilities, and the same faces appear everywhere.“
— Morrissey
„You don't realize that you're intelligent until it gets you into trouble.“
— James Baldwin