My Boss, the White-haired Nun

"Actually, I don't want you to set foot on this battlefield, but since you have chosen this place, please be strong, you must not give up, and you must uphold your beliefs, so that you can see the happiness you expect."
"Then what about you, teacher? What are your attachments, teacher?"
"..."
"teacher?"
"Silly child, it is precisely because I haven't experienced these things that I hope you can have them. In this world, what you can't get is the most precious."