It's ruinous for the soul to be anxious about the future and miserable in advance of misery, engulfed by anxiety that the things it desires might remain its own until the very end. For such a soul will never be at rest -- by longing for things to come it will lose the ability to enjoy present things.
-- Seneca, Moral Letters, 98.5b-6a
"The pragmatist, the person of action, is too busy to waste time on such silliness....let the news come when it does. Be too busy working to care."
* Source: The Daily Stoic by Ryan Holiday and Stephen Hanselman