Nothing can temper the spirit ...

Nothing can temper the spirit of a warrior as much as the challenge of dealing with impossible people in positions of power. Only under those conditions can warriors acquire the sobriety and serenity to withstand the pressure of the unknowable.
Nothing can temper the spirit of a warrior as much as the challenge of dealing with impossible people in positions of power. Only under those conditions can warriors acquire the sobriety and serenity to withstand the pressure of the unknowable.

Quotes from the same author

The trick is in what one emphasizes. We either make ourselves miserable, or we make ourselves happy. The amount of work is the same.
“We choose whether to be warriors or to be ordinary.”
“A warrior seeks to act rather than talk.”
“A warrior lives by acting, not by thinking about acting, nor by thinking about what he will think he has finished acting.”
“A warrior never worries about his fear.”