"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 a lion or a gazelle--when the sun comes up, you'd better be running."
-Roger Bannister, first person to run a mile in under four minutes