I'm in a hockey mood, so three from Herb Brooks:
"The legs feed the wolves."
"You don't have the talent to make it on talent alone."
"Hard work beats talent when talent doesn't work hard."
Oh, and a couple of others from my personal list of rules, collected over time:
"If the zamboni is on the ice, you're not." Said by the team captain correcting one of his players.
"Any dog that weighs less than fifty pounds is a cat, and cats are pointless." Ron Swanson
"Never run aground with the anchor in the pipe. It upsets Lloyds." I forget who first said this, but it's really good advice
"Respect the Good Idea Cut Off Point." A Staff Officer of my acquaintance who shall remain nameless for his protection
"There is a high cost to low living." I forget who first said this, it might also have been Herb Brooks. But it's important to know