[kstenerud]

Grit and blood and spite.

You find that when you've reach the bottom of the barrel, you haven't because it actually goes a lot deeper than you thought it would. You are capable of magnitudes more than you think you are. It's only when you're in a situation where failure is not an option that you discover this.

In the first world, we have it so incredibly easy that most of us never discover our true potential.