"Mourning his misfortune and angering him is indisputable"-Lu Xun
explained that
Mourning means sadness, regret and sympathy, and "Mourning his misfortune" means feeling sad about someone's misfortune.
Anger means anger and regret. "Anger is indisputable" means feeling angry and sorry for someone who doesn't fight or live up to expectations.
the whole sentence means: I feel sad about someone's unfortunate experience, and he/she feels angry and sorry for not fighting and disappointing.
background
Lu Xun's famous saying originated from Lu Xun, who made it up by himself and created such a famous vocabulary to express his feelings.
China has been a culture for thousands of years. Every year, some famous words have been created and passed down, so Chinese can be so colorful.
is Lu Xun's description of Kong Yiji in the novel Kong Yiji, in order to express the author's feelings of helplessness, sympathy and anger towards the Chinese people at that time.