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| 'Tis the business of little minds to shrink; but he whose heart is firm, and whose conscience approves his conduct, will pursue his principles unto death. | | Thomas Paine | |
| All that I desire to point out is the general principle that life imitates art far more than art imitates life. | | Oscar Wilde | |
| But the creative principle resides in mathematics. In a certain sense, therefore, I hold true that pure thought can grasp reality, as the ancients dreamed. | | Albert Einstein | |
| By denying scientific principles, one may maintain any paradox. | | Galileo Galilei | |
| Conquest is not in our principles; it is inconsistent with our government | | Thomas Jefferson | |
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| Experiment is necessary in establishing an academy, but certain principles must apply to this business of art as to any other business which affects the artistic tic sense of the community. | | Marshall McLuhan | |
| For neither birth, nor wealth, nor honors, can awaken in the minds of men the principles which should guide those who from their youth aspire to an honorable and excellent life, as Love awakens them | | Plato | |
| From principles is derived probability, but truth or certainty is obtained only from facts. | | Tom Stoppard | |
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| Here is my principle: Taxes shall be levied according to ability to pay. That is the only American principle. | | Franklin D. Roosevelt | |
| Hold faithfulness and sincerity as first principles | | Confucius | |
| I like persons better than principles, and I like persons with no principles better than anything else in the world. | | Oscar Wilde | |
| I'm slowly becoming a convert to the principle that you can't motivate people to do things, you can only demotivate them. The primary job of the manager is not to empower but to remove obstacles. | | Scott Adams | |
| If there be one principle more deeply rooted than any other in the mind of every American, it is, that we should have nothing to do with conquest | | Thomas Jefferson | |
| If there is any principle of the Constitution that more imperatively calls for attachment than any other it is the principle of free thought, not free thought for those who agree with us but freedom for the thought that we hate. | | Oliver Wendell Holmes | |
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| It is easier to fight for one's principles than to live up to them. | | Alfred Adler | |
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