山中 さんちゅうの賊 ぞくを破 やぶるは易 やすく心中 しんちゅうの賊 ぞくを破 やぶるは難 かたし

sanchūno zokuo yaburuwa yasuku shinchūno zokuo yaburuwa katashi

1. it's hard to discipline one's mind; defeating the bandits in the mountains is easy; defeating the bandit in one's heart is hard — literal