From Along Came a Spider, James Patterson
"In the clearing stands a boxer
And a fighter by his trade,
And he carries the reminders
Of every blow that's laid him low
And cut him 'til he cried out
In his anger and his shame,
"I am leaving, I am leaving,"
But the fighter still remains."
"The Boxer," Paul Simon
And this one:
You gotta do what you gotta do. There is no other way. And there never was.