life without love, is no life at all

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He who thinks little errs much.

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Learning is the only thing that never disappoints us.

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It's not enough that you believe what you see. You must also understand what you see.

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Learning is the only thing the mind never exhausts, never fears, and never regrets.

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You must grow in patience when you meet with great wrongs, and they will then be powerless to vex your mind.

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once you have tasted the taste of sky, you will forever look up

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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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If you find from your own experience that something is a fact and it contradicts what some authority has written down, then you must abandon the authority and base your reasoning on your own findings.

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Not to punish evil is equivalent to authorizing it.

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