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| It is not enough to be an upright man, we must be seen to be one; society does not exist on moral ideas only | | Honore de Balzac | |
| It seems to me that a great university ought to have room in it for men subscribing to every sort of idea that is currently prevalent | | Henry Louis Mencken | |
| Keep on the lookout for novel ideas that others have used successfully. Your idea has to be original only in its adaptation to the problem you're working on. | | Thomas Alva Edison | |
| Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone. | | Albert Einstein | |
| Most people are other people. Their thoughts are someone else's opinions, their lives a mimicry, their passions a quotation. | | Oscar Wilde | |
| My ideas usually come not at my desk writing but in the midst of living. | | Anais Nin | |
| Nearly every man who develops an idea works it up to the point where it looks impossible, and then he gets discouraged. That's not the place to become discouraged. | | Thomas Alva Edison | |
| Never, never rest contented with any circle of ideas, but always be certain that a wider one is still possible. | | Pearl Bailey | |
| New ideas pass through three periods: 1) It can't be done. 2) It probably can be done, but it's not worth doing. 3) I knew it was a good idea all along! | | Arthur C. Clarke | |
| No grand idea was ever born in a conference, but a lot of foolish ideas have died there. | | F. Scott Fitzgerald | |
| Not just in commerce but in the world of ideas too our age is putting on a veritable clearance sale. Everything can be had so dirt cheap that one begins to wonder whether in the end anyone will want to make a bid. | | Søren Kierkegaard | |
| Religious ideas have sprung from the same need as all the other achievements of culture: from the necessity for defending itself against the crushing supremacy of nature | | Sigmund Freud | |
| Serious-minded people have few ideas. People with ideas are never serious. | | Paul Valery | |
| The air is full of ideas. They are knocking you in the head all the time. You only have to know what you want, then forget it, and go about your business. Suddenly, the idea will come through. It was there all the time. | | Henry Ford | |
| The dogmas of the quiet past are inadequate to the stormy present. The occasion is piled high with difficulty, and we must rise with the occasion. As our case is new, so we must think anew and act anew. | | Abraham Lincoln | |
| The ideas gained by men before they are twenty-five are practically the only ideas they shall have in their lives. | | William James | |
| The ideas I stand for are not mine. I borrowed them from Socrates. I swiped them from Chesterfield. I stole them from Jesus. And I put them in a book. If you don't like their rules, whose would you use? | | Dale Carnegie | |
| The insolence of authority is endeavoring to substitute money for ideas | | Frank Lloyd Wright | |
| The kind of man who wants government to adopt and enforce his ideas is always the kind of man whose ideas are idiotic | | Henry Louis Mencken | |
| The people who oppose your ideas are inevitably those who represent the established order that your ideas will upset. | | Anthony J. D'Angelo | |
