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Men often take their imagination for their heart and they believe they are converted as soon as they think of being converted.

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Two things control man's nature: instinct and experience.

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The sensitivity of men to small matters, and their indifference to great ones, indicates a strange inversion.

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Men are so inevitably mad that not to be mad would be to give a mad twist to madness.

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All things can be deadly to us, even the things made to serve us; as in nature walls can kill us, and stairs can kill us, if we do not walk circumspec...more

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Those honor nature well, who teach that she can speak on everything.

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Nature has made all her truths independent of one another. Our art makes one dependent on the other.