It is bias to think that the art of war is just for killing people. It is not to kill people, it is to kill evil. It is a stratagem to give life to many people by killing the evil of one person.
As quoted in The Japanese Art of War (1991) by Thomas Cleary
See first with your mind, then with your eyes, and finally with your body.Yagyū Munenori
Conquering evil, not the opponent, is the essence of swordsmanship.Yagyū Munenori
It is easy to kill someone with a slash of a sword. It is hard to be impossible for others to cut down.Yagyū Munenori