If you listen to one side, you will be dark, if you listen to both, you will be enlightened

Good medicine is bitter in the mouth and good for the disease, but honest advice is offensive to the ears and contrary to the heart.

If you don't listen to the old man's words, you will suffer the consequences.

Good medicine is bitter in the mouth and good for the disease, but honest words are offensive to the ears and to the heart. Source: Western Han Dynasty·Sima Qian's "Historical Records·Liuhou Family" Listening to one side will lead to darkness, and listening to both will lead to enlightenment. Wei Zheng If you don't listen to the old man's words, you will suffer the consequences.

This sentence is based on an allusion that appeared in the Yuan Dynasty. The old people here refer to the class with life experience and experience