Doesn't have to be running related, could be motivational, depressing, truth, anything.
what is your favourite quote of all time...
one of mine is from The Departed
"I don't want to be a product of my enviroment, I want my enviroment to be a product of me."
another one....
"Somebody once asked me what type of person I would be if I could be anyone in the world. He then reminded me I can be anyone in the world."