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| Many people think they are thinking when they are merely rearranging their prejudices. | | William James | |
| Most people are unable to write because they are unable to think, and they are unable to think because they congenitally lack the equipment to do so, just as they congenitally lack the equipment to fly over the moon. | | Henry Louis Mencken | |
| Most people of action are inclined to fatalism and most of thought believe in providence. | | Honore de Balzac | |
| No doubt another may also think for me; but it is not therefore desirable that he should do so to the exclusion of my thinking for myself | | Henry David Thoreau | |
| People think of the inventor as a screwball, but no one ever asks the inventor what he thinks of other people. | | Charles F. Kettering | |
| People who bite the hand that feeds them usually lick the boot that kicks them. | | Eric Hoffer | |
| People who develop the habit of thinking of themselves as world citizens are fulfilling the first requirement of sanity in our time | | Norman Cousins | |
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| Read it as you would any other book; think of it as you would of any other; get the bandage of reverence from your eyes; drive from your heart the phantom of fear; push from the throne of your brain the cowled form of superstition - then read the Holy Bible, and you will be amazed that you ever, for one moment, supposed a being of infinite wisdom, goodness, and purity to be the author of such ignorance and of such atrocity. | | Robert Green Ingersoll | |
| Sad people dislike the happy, and the happy the sad; the quick thinking the sedate, and the careless the busy and industrious. | | Horace | |
| Sometimes I think that a vacuum is a hell of a lot better than some of the stuff that nature replaces it with | | Tennessee Williams | |
| The best thinking has been done in solitude. The worst has been done in turmoil. | | Thomas Alva Edison | |
| The end comes when we no longer talk with ourselves. It is the end of genuine thinking and the beginning of the final loneliness. | | Edward Gibbon | |
| The end of man is action, and not thought, though it be noblest | | Thomas Carlyle | |
| The highest form of pure thought is in mathematics | | Plato | |
| The history of thought may be summed up in these words: it is absurd by what it seeks and great by what it finds | | Paul Valery | |
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| The real purpose of books is to trap the mind into doing its own thinking. | | Christopher Morley | |
| The world's greatest thinkers have often been amateurs; for high thinking is the outcome of fine and independent living, and for that a professional chair offers no special opportunities | | Havelock Ellis | |