我が身をつねって人の痛さを知れ

わがみをつねってひとのいたさをしれwagamiotsunettehitonoitasaoshire

expression

1. walk a mile in other's shoes to understand their suffering
2. you can't appreciate others' suffering until you've gone through it yourself
3. pinch yourself and know others' pain

Study it in Yanamino