It's not just the influence of the environment on people, Zhu Hechi: something that can be interpreted as red; Ink and black are black things. Red is opposite to black, and red can be understood as red is just; Well, black is relatively evil or bad, no matter who you are with; Will be infected by their own conduct, in other words, learn from good people and bad people.

Another way of saying "red" is to describe ancient soldiers (generals and soldiers), such as a Hong Haier. When you are with them, you will have a red heart like them and become a soldier who died for his country. If you follow those scholars, you will naturally be cultivated into a scholar by their bookishness.