A Brief History of Time
When it comes down to it, we don't have much of a choice, do we?
Everything we do, we move forward. That's just how time works! Each moment is a progressive movement toward--something? Well, it's hard to envision what's really at the end of our paths, but the momentum is certainly there whether we want it or not. I know it's not the point of Hawking's book, but he definitely knew it... Time is brief. I'm sure I've dumbed his concepts down far beyond his intentions, but I ultimately learned a good lesson from him, regardless.
And here it is:
F[orget] the universe. It's one big black hole. Find your happiness where you are, because the only time you truly have is now. Live it and love it without regret. And there's now questioning it: You'll keep moving forward.