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| In that way imagination and intelligence enter into our existence in the part of servants of the primary instincts | | Albert Einstein | |
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| Intelligence is not to make no mistakes, but quickly to see how to make them good. | | Bertolt Brecht | |
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| Intelligent or not, we all make mistakes and perhaps the intelligent mistakes are the worst, because so much careful thought has gone into them | | Peter Ustinov | |
| It has yet to be proven that intelligence has any survival value. | | Arthur C. Clarke | |
| It is not clear that intelligence has any long-term survival value | | Stephen Hawking | |
| It is not enough to have a good mind; the main thing is to use it well. | | Rene Descartes | |
| It is wiser to find out than to suppose | | Mark Twain | |
| Like many intellectuals, he was incapable of saying a simple thing in a simple way | | Marcel Proust | |
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| Military intelligence is a contradiction in terms. | | Groucho Marx | |
| Nowadays to be intelligible is to be found out. | | Oscar Wilde | |
| Only the extremely ignorant or the extremely intelligent can resist change. | | Socrates | |
| Seest thou a man wise in his own conceit? There is more hope of a fool than of him (Proverbs 26:12). | | Bible | |
| Some people unable to go to school were more educated and even more intelligent than college professors. | | Maya Angelou | |
| The brain is a wonderful organ. It starts working the moment you get up in the morning and does not stop until you get into the office. | | Robert Frost | |
| The first method for estimating the intelligence of a ruler is to look at the men he has around him. | | Niccolo Machiavelli | |
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