"When a raven happens to croak unluckily, don't allow the appearance hurry you away with it, but immediately make the distinction to yourself, and say, 'None of these things are foretold to me; but either to my paltry body, or property, or reputation, or children, or wife. But to me all omens are lucky, if I will. For whichever of these things happens, it is in my control to derive advantage from it.'"
Epictetus, "The Enchiridion"