Lu Xun commented on Zhuangzi's "cold-eyed insight into things and understanding the world". "Hot intestines" means that you can't forget your feelings, understand reason and understand human nature. In Zhuangzi Loneliness, he said: "Zhuangzi's eyes are extremely cold, and his heart is the hottest. My eyes are cold, so I don't care about right or wrong; Warm heart, so full of emotion. Although I know it's useless, I can't forget it. Finally, this is a hot sausage.