People who liked to read simple books were generally described as people who had deep thinking abilities and liked to explore the mysteries of human nature and the universe. The plain book was an ancient Chinese philosophy book that contained many teachings about morality, the universe, and life. Therefore, people who liked to read simple books might have a deeper understanding and thinking about these aspects and would apply these understandings and thoughts to their daily lives. They might also have a more rigorous logical thinking ability, able to analyze problems from different angles and obtain new revelations from them. Generally speaking, people who liked to read plain books might be regarded as people with deep thinking ability and wisdom.