A passage from Epictetus
Epictetus, Discourses III.22
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If you wish to live a life free from sorrow, consider nothing as your own that you cannot take with you when you die. Consider your children, your wife, your property, your body, as only lent to you.
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.