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— Leonhard Euler"Logic is the foundation of the certainty of all the knowledge we acquire."
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There is little difference between the Zulu warrior who smeared bis body with lion's fat and the modern woman who dabs hers with expensive perfume. The one was trying to acquire the courage of the king of beasts, the other is attempting to acquire the irresistible sexuality of flowers. The underlying principle is the same.
— Tom Robbins
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In every science, after having analysed the ideas, expressing the more complicated by means of the more simple, one finds a certain number that cannot be reduced among them, and that one can define no further. These are the primitive ideas of the science; it is necessary to acquire them through experience, or through induction; it is impossible to explain them by deduction.
— Giuseppe Peano
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