If you live with the lame, you will learn to limp. Just like making friends, if you make a gentleman with high moral character, you will be well edified, and you will also increase your knowledge and improve your own quality; On the other hand, if you have a bad friend, you will be adversely affected, and you will be in danger of being implicated.
Similarly, staying away from unhealthy books is just like staying away from bad people; Reading positive energy books, just like making a good friend, can improve one's ideological realm, establish a good outlook on life and values, and become a useful talent for the country and society.