A passage from Epictetus
Epictetus, Discourses IV.1
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The wise man is not grieved by the loss of children or friends. For he knows that they are not his own, but only given to him by nature for a time. He is content to return them when the time comes.
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.