I love that one of the best quotes I have ever found about the power of running is from Wilma Rudolph. She's a true inspiration and really spoke of running eloquently.
Here are some more of her quotes on running and life:
"Believe me, the reward is not so great without the struggle.
"I loved the feeling of freedom in running, the fresh air, the feeling that the only person I'm competing with is me."
"Never underestimate the power of dreams and the influence of the human spirit. We are all the same in this notion. The potential for greatness lives within each of us."