Marcus Aurelius' Meditations: The Stoic Ideal

"Fight one more round. When your arms are so tired that you can hardly lift your hands to come on guard, fight one more round. When your nose is bleeding and your eyes are black and you are so tired that you wish your opponent would crack you one on the jaw and put you to sleep, fight one more round - remembering that the man who always fights one more round is never whipped."
Gentleman Jim Corbett, world champion boxer and world class stoic