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A person starts to live when he can live outside himself.
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Anybody who really wants to abolish war must resolutely declare himself in favor of his own country's resigning a portion of sovereignty in place of international institutions.
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Not all that counts, can be counted.
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To be sure, the doctrine of a personal God interfering with natural events could never be refuted, in the real sense, by science, for this doctrine can always take refuge in those domains in which scientific knowledge has not yet been able to set foot.
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To the extent math refers to reality, we are not certain to the extent we are certain, math does not refer to reality.
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It is an outcome of faith that nature-as she is perceptible to our five senses-takes the character of such a well formulated puzzle.
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On quantum theory I use up more brain grease than on relativity.
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One reason why mathematics enjoys special esteem, above all other sciences, is that its laws are absolutely certain and indisputable, while those of other sciences are to some extent debatable and in constant danger of being overthrown by newly discovered facts.
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The most superior of scientific goals is to embrace a maximum of experiment with a minimum of hypotheses.
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Whoever is devoid of the capacity to wonder, whoever remains unmoved, whoever cannot contemplate or know the deep shudder of the soul in enchantment, might just as well be dead for he has already closed his eyes upon life.
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Science is the century-old endeavor to bring together by means of systematic thought the perceptible phenomena of this world into as thorough-going an association as possible.
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No one must think that Newton’s great creation can be overthrown in any real sense by this Theory of Relativity or by any other theory. His clear and wide ideas will for ever retain their significance as the foundation on which our modern conceptions of physics have been built.
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I am absolutely convinced that no wealth in the world can help humanity forward, even in the hands of the most devoted worker in this cause. The example of great and pure characters is the only thing that can produce fine ideas and noble deeds. Money only appeals to selfishness and always tempts its owners irresistibly to abuse it.
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No fairer destiny could be allotted to any physical theory than that it should of itself point out the way to the introduction of a more comprehensive theory, in which it lives on as a limiting case.
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In scientific thinking are always present elements of poetry. Science and music requires a thought homogeneous.
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It is intelligent to have a plan, but neurotic to fall in love with it.
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You must be aware that most men, and also not only a few women, are by nature not monogamous. This nature makes itself even more forceful when tradition and circumstance stand in an individual's way.
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Highly developed spirits often encounter resistance from mediocre minds.
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During the last century, and part of the one before, it was widely held that there was an unreconcilable conflict between knowledge and belief.
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Everything that the human race has done and thought is concerned with the satisfaction of deeply felt needs and the assuagement of pain. One has to keep this constantly in mind if one wishes to understand spiritual movements and their development. Feeling and longing are the motive force behind all human endeavor and human creation, in however exalted a guise the latter may present themselves to us.
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It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.
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While it is true that science, to the extent of its grasp of causative connections, may reach important conclusions as to the compatibility and incompatibility of goals and evaluations, the independent and fundamental definitions regarding goals and values remain beyond science's reach.
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I admit that thoughts influence the body.
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There is no salvation for civilization, or even the human race, other than the creation of a world government.