A passage from Epictetus
Epictetus, Discourses I.22
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The wise man will not be troubled by the loss of children or friends. He knows that they are not his own, but only lent to him by nature.
Related passages
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From Sextus, a benevolent disposition, and the example of a family governed in a fatherly manner, and the idea of living conformably to nature; and gravity without affectation.
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This thou must always bear in mind, what is the nature of the whole, and what is my nature, and how this is related to that, and what kind of a part it is of what kind of a whole.
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We ought to observe also that even the things which follow after the things which are produced according to nature contain something pleasing and attractive.