It means to sublimate one's emotional and moral level through reading. In fact, this kind of cultivation of sentiment deliberately did something at a very young age. Making some handicrafts or drinking tea can achieve this effect.

I can improve my mental state through the influence of some external conditions. A relatively stable mental state formed by feelings, thoughts and beliefs. Through the influence of some external things, let your temperament be improved or even sublimated! For example, through music, art and photography, cultivate yourself and improve your sentiment!

Modern people's bodies are sometimes very satisfied, but the spiritual world will appear very empty. From kindergarten, teachers will teach everyone to read more books, take part in some meaningful activities and cultivate their sentiments. You can do many activities to cultivate sentiment first. Even many small things can be done.