A quote
Nay rather, to adopt a phrase which is braver and nearer the truth—one on which you may more safely prop your spirit—say to yourself, whenever things turn out contrary to your expectation: “Heaven decreed better!” If you are thus poised, nothing will affect you and a man will be thus poised if he reflects on the possible ups and downs in human affairs before he feels their force, and if he comes to regard children, or wife, or property, with the idea that he will not necessarily possess them always and that he will not be any more wretched just because he ceases to possess them.
Seneca·Letter 98 — On the Fickleness of Fortune (§5)·trans. Gummere