Since baseball is fundametally built around failure, ours takes care of any reason, excuese etc.
"Excellence is Expected!"
We do cite other often:
"Repetition is no fun but it's the reason we have won."
"Take one day off and you know it. TAke two days off and your opponent knows it. TAke three days off and everyone knows it."
"In the warrious code there's no surrender. Though your body says quit, your spirt cries never. Deep in your soul's an undying ember that knows its you against you. It's the paradox that drives us all."
"There comes a time when you have to stop dreaming of the man you want to be and start being the man you have become." Bruce Springsteen