The simple shortcut: the way we respond to the things that we can't change can instantly transform our lives. "That's interesting," is a thousand times more productive than, "that's terrible." Even more powerful is our ability to stop experiencing failure before it even happens, because, of course, it usually doesn't.
Happiness, for most of us, is a choice. Reality is not. It seems, though, that choosing to be happy ends up changing the reality that we keep track of.
The way you see the world—and the way you deal with things—is often more important than what is actually happening out there.