To acquire even a degree of self-control, he had had to ponder the question of life and death for many years, discipline himself at every turn of the road, force himself to undergro the rigors of a samurai’s training. With no training or conscious self-discipline, this woman was able to say without the slightest hesitation that she, too, was prepared to die if he did. Her face expressed perfect serenity, her eyes telling him she was neither lying nor speaking impulsively. She seemed almost happy over the prospect of following him in death. He wondered, with a tinge of shame, how women could be so strong.

Musashi, by Eiji Yoshikawa.

I love this book.