Everything changes, nothing perishes.

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  What then is time? If no one asks me, I know; if I wish to explain it to one who asks, I do not know.

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  You cannot step into the same river twice.

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  Dust you are, and to dust you shall return.

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  Constant dripping wears away the stone.

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  Never put off until tomorrow what you can do today.

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  Haste makes waste.

All sayings