How did "animals are worse than animals" come about?

Ruanji was a famous poet and writer at that time. He sometimes studies at home and stays indoors for days on end. Sometimes I travel and don't go home for a few days; Sometimes he drives a car alone and walks casually, regardless of the path. The car was cornered, so he went back crying. Biography of Ruan Ji in the Book of Jin said that he "suddenly forgot his body when he was proud (even forgot his existence when he was proud)." "Get carried away" came into being, which means to focus on what you have got and forget your position. Later, it is often used to describe shallow people. They are ecstatic when they get a little success and can't control themselves.

On one occasion, Ruan Ji was in General Si Mazhao's office, and heard a report from relevant officials that a son had killed his mother. Ruan Ji lamented: "You can kill my father, even my mother!" The whole audience blamed him for his slip of the tongue. Si Mazhao said, "Killing your father is the most heinous thing in the world. What do you think is ok? " Ruan Ji said: "Animals only know who their mother is, but they don't know who their father is. Killing father belongs to the category of animals. Killing a mother is worse than killing an animal. " Everyone was surprised. This is the origin of the idiom "Animals are worse than animals".