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| A good head and a good heart are always a formidable combination. | | Nelson Mandela | |
| A great deal of intelligence can be invested in ignorance when the need for illusion is deep. | | Saul Bellow | |
| An intelligence service is, in fact, a stupidity service | | E. B. White | |
| An intelligent man is sometimes forced to be drunk to spend time with his fools. | | Ernest Hemingway | |
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| Being intelligent is not a felony, but most societies evaluate it as at least a misdemeanor. | | Lazarus Long | |
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| Columbus's eggs lie around by the hundreds of thousands, but Columbuses are met with less frequently. | | Adolf Hitler | |
| Continuous effort - not strength or intelligence - is the key to unlocking our potential | | Winston Churchill | |
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| Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence. | | Albert Einstein | |
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| I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use. | | Galileo Galilei | |
| I know that I am intelligent, because I know that I know nothing. | | Socrates | |
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| Ignorance of all things is an evil neither terrible nor excessive, nor yet the greatest of all; but great cleverness and much learning, if they be accompanied by a bad training, are a much greater misfortune. | | Plato | |
| In our civilization, and under our republican form of government, intelligence is so highly honored that it is rewarded by exemption from the cares of office. | | Ambrose Bierce | |