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| A subtle thought that is in error may yet give rise to fruitful inquiry that can establish truths of great value. | | Isaac Asimov | |
| All intelligent thoughts have already been thought; what is necessary is only to try to think them again. | | Johann Wolfgang von Goethe | |
| All my life I have tried to pluck a thistle and plant a flower wherever the flower would grow in thought and mind. | | Abraham Lincoln | |
| All that we are is the result of what we have thought. | | Buddha | |
| All that we are is the result of what we have thought. If a man speaks or acts with an evil thought, pain follows him. If a man speaks or acts with a pure thought, happiness follows him, like a shadow that never leaves him. | | Buddha | |
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| All thought is a feat of association; having what's in front of you bring up something in your mind that you almost didn't know you knew | | Robert Frost | |
| Always aim at complete harmony of thought and word and deed. Always aim at purifying your thoughts and everything will be well. | | Mahatma Gandhi | |
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| Books serve to show a man that those original thoughts of his aren't very new after all | | Abraham Lincoln | |
Dubito ergo cogito; cogito ergo sum.
(I doubt, therefore I think; I think therefore I am) | | Rene Descartes | |
| Everything has been said, and we are more than seven thousand years of human thought too late | | Jean de la Bruyere | |
| Few things are more satisfying than seeing your own children have teenagers of their own | | Doug Larson | |
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| I always thought I was Jeanne d'Arc and Bonaparte. How little one knows oneself. | | Charles de Gaulle | |
| I define nothing. Not beauty, not patriotism. I take each thing as it is, without prior rules about what it should be. | | Bob Dylan | |
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| I've said many a time that I think the Un-American Activities Committee in the House of Representatives was the most un-American thing in America! | | Harry S Truman | |
| If it is true that the violin is the most perfect of musical instruments, then Greek is the violin of human thought | | Helen Keller | |
