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We are speaking on this occasion, not as members of this or that nation, continent, or creed, but as human beings, members of the species Man, whose continued existence is in doubt.
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It is amusing to hear the modern Christian telling you how mild and rationalistic Christianity really is and ignoring the fact that all its mildness and rationalism is due to the teaching of men who in their own day were persecuted by all orthodox Christians.
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I do not pretend to start with precise questions. I do not think you can start with anything precise. You have to achieve such precision as you can, as you go along.
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The idea that the poor should have leisure has always been shocking to the rich.
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The conception of the necessary unit of all that is resolves itself into the poverty of the imagination, and a freer logic emancipates us from the straitwaistcoated benevolent institution which idealism palms off as the totality of being.
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Can a society in which thought and technique are scientific persist for a long period, as, for example, ancient Egypt persisted, or does it necessarily contain within itself forces which must bring either decay or explosion?
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In democratic countries, the most important private organizations are economic. Unlike secret societies, they are able to exercize their terrorism without illegality, since they do not threaten to kill their enemies, but only to starve them.
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Every great study is not only an end in itself, but also a means of creating and sustaining a lofty habit of mind.
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To save the world requires faith and courage: faith in reason, and courage to proclaim what reason shows to be true.
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It is not by prayer and humility that you cause things to go as you wish, but by acquiring a knowledge of natural laws.
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One who believes, as I do, that the free intellect is the chief engine of human progress, cannot but be fundamentally opposed to Bolshevism, as much as to the Church of Rome.
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There is darkness without and when I die there will be darkness within. There is no splendor, nor vastness anywhere; only triviality for a moment and then nothing.
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I like mathematics because it is not human and has nothing particular to do with this planet or with the whole accidental universe – because, like Spinoza's God, it won't love us in return.
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Probably in time physiologists will be able to make nerves connecting the bodies of different people; this will have the advantage that we shall be able to feel another man's tooth aching.
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Too little liberty brings stagnation, and too much brings chaos.
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Thus mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.
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The facts of science, as they appeared to him Heraclitus, fed the flame in his soul, and in its light, he saw into the depths of the world.
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While it is true that science cannot decide questions of value, that is because they cannot be intellectually decided at all, and lie outside the realm of truth and falsehood. Whatever knowledge is attainable, must be attained by scientific methods; and what science cannot discover, mankind cannot know.
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I find that the whiter my hair becomes the more ready people are to believe what I say.
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The Calculus required continuity, and continuity was supposed to require the infinitely little; but nobody could discover what the infinitely little might be.
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Suppose atomic bombs had reduced the population of the world to one brother and one sister, should they let the human race die out? I do not know the answer, but I do not think it can be in the affirmative merely on the ground that incest is wicked.
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People seem good while they are oppressed, but they only wish to become oppressors in their turn: life is nothing but a competition to be the criminal rather than the victim.
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The 'social contract,' in the only sense in which it is not completely mythical, is a contract among conquerors, which loses its raison d'être if they are deprived of the benefits of conquest.
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Men tend to have the beliefs that suit their passions. Cruel men believe in a cruel God, and use their belief to excuse their cruelty. Only kindly men believe in a kindly God, and they would be kindly in any case.