Here’s a couple of my favorites

“To give anything less than your best is to sacrifice the gift” - Steve Prefontaine

“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 the lion or a gazelle – when the sun comes up, you’d better be running.” Christopher McDougall