Every morning in Africa, a gazelle wakes up, it knows it must outrun the fastest lion or it will be killed. Every morning in Africa, a lion wakes up. It knows it must run faster than the slowest gazelle, or it will starve. It doesn't matter whether you're the lion or a gazelle-when the sun comes up, you'd better be running.
Christopher McDougall (2010). “Born to Run: The hidden tribe, the ultra-runners, and the greatest race the world has never seen”, p.13, Profile Books