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No path leads from a knowledge of that which is to that which should be.
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Necessity is the mother of all invention.
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There's been a quantum leap technologically in our age, but unless there's another quantum leap in human relations, unless we learn to live in a new way towards one another, there will be a catastrophe.
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One must shy away from questionable undertakings, even when they bear a high-sounding name.
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Only one who devotes himself to a cause with his whole strength and soul can be a true master. For this reason mastery demands all of a person.
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One should not pursue goals that are easily achieved. One must develop an instinct for what one can just barely achieve through one’s greatest efforts.
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What you can't imagine, you can't discover.
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We Jews have no other means of self-defense than our solidarity.
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It is also a natural thing for a serious young man that he should form for himself as precise an idea as possible of the goal of his desires.
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Although I tried to be universal in thought, I am European by instinct and inclination.
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Do things sound better in your head before you say them, or do you even run them through there first?
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It's not that I'm so smart, it's just that I stay with problems longer.
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Never let yourself be seduced by any problem, no matter how difficult.
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If the workers of this world, men and women, decide not to manufacture and transport ammunition, it would end war for all time. We must do that. Dedicate our lives to drying up the source of war; ammunition factories.
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Don't dream of being a good person, be a human being is valuable and gives value to life.
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Scientists believe that every occurrence, including the affairs of human beings, is due to the laws of nature. Therefore a scientist cannot be inclined to believe that the course of events can be influenced by prayer, that is, by a supernaturally manifested wish.
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Common sense consists of those layers of prejudice laid down before the age of 18.
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The daily struggle does not arise from a purpose or a program, but from an immediate need.
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Nothing happens til something moves.
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What interests me most is whether God could have made the world differently.
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There is no greater satisfaction for a just and well-meaning person than the knowledge that he has devoted his best energies to the service of the good cause.
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The mind that opens to a new idea never returns to its original size.
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The future is of greater interest to me than the past, since that is where I intend to spend the rest of my life.
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We must begin to inculcate our children against militarism by educating them in the spirit of pacifism. Our schoolbooks glorify war and conceal it's horror. I would teach peace rather than war.