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They must often change who would be constant in happiness or wisdom.

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Change is inevitable. In a progressive country change is constant.

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But in this world nothing can be said to be certain, except death and taxes.

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The only certainty is that nothing is certain.

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I prefer complexity to certainty, cheerful mysteries to sullen facts.

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There is no such thing on earth as an uninteresting subject; the only thing that can exist is an uninterested person.

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I wanted to be bored to death, as good a way to go as any.

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I came upstairs into the world; for I was born in a cellar.

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For that which is born death is certain, and for the dead birth is certain. Therefore grieve not over that which is unavoidable.

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The more the fruits of knowledge become accessible to men, the more widespread is the decline of religious belief.

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