A passage from Epictetus
Epictetus, Discourses I.1
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I must die. Must I then die lamenting? I must be put in chains. Must I then also lament? I must go into exile. Does any man then hinder me from going with smiles and cheerfulness?
Related passages
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Your present opinion founded on understanding, your present conduct directed to social good, your present disposition contented with everything that happens — that is enough.
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Of human life the time is a point, the substance flowing, the perception dull... The only thing that escorts a man on his way is philosophy.
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Do not act as if thou wert going to live ten thousand years. Death hangs over thee. While thou livest, while it is in thy power, be good.