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While I thought that I was learning how to live, I have been learning how to die.

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Wisdom is the daughter of experience

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Knowledge of the past and of the places of the earth is the ornament and food of the mind of man.

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The knowledge of all things is possible

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Learning never exhausts the mind.

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Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.

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The common sense is that which judges the things given to it by other senses.

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All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.