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— Carl Sagan"The uniqueness of humans has been claimed on many grounds, but most often because of our tool-making, culture, language, reason and morality. We have them, the other animals don't, and -- so the argument goes -- that's that."
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Why should not the knowledge, the skill, the expertness, the assiduity, and the spirited hazards of trade and commerce, when crowned with success, be entitled to give those flattering distinctions by which mankind are so universally captivated? Such are the specious, but false arguments for a proposition which always will find numerous advocates, in a nation where men are every day starting up from obscurity to wealth. To refute them is needless. The general sense of mankind cries out, with irresistible force, "Un gentilhomme est toujours gentilhomme.
— James Boswell
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It has often been argued that absolute scepticism is self-contradictory; but this is a mistake: and even if it were not so, it would be no argument against the absolute sceptic, inasmuch as he does not admit that no contradictory propositions are true. Indeed, it would be impossible to move such a man, for his scepticism consists in considering every argument and never deciding upon its validity; he would, therefore, act in this way in reference to the arguments brought against him.
— Charles Sanders Peirce
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