Epictetus
50-120. Greek philosopher.
A wise man is he who does not grieve for the thing which he has not, but rejoices for those which he has.
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There is only one way to happiness and that is to cease worrying about things which are beyond the power of our will.
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It is impossible to begin to learn that which one thinks one already knows.
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Whoever does not regard what he has as most ample wealth, is unhappy, though he be master of the world.
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