This sentence was not a joke from an online novel, but a common saying in life. It means that if a person has less things in his or her mind, his or her thinking will become more concise and clear, and his or her mind will be more flexible and able to respond and solve problems faster. On the contrary, if a person's mind is filled with more things, his/her thinking will become more complicated and his/her ability to think and solve problems will be weakened accordingly. There was a profound meaning and philosophical significance behind this saying. It tells us that knowledge and wisdom are not directly proportional but directly proportional to the depth and breadth of a person's thinking. The more knowledge a person has, the more complicated his or her thinking will be, and the more difficult it will be to deal with complex problems and challenges. On the contrary, if a person lacked knowledge, his or her thinking would be more concise, and he or she would be able to respond to simple problems and situations more quickly. This proverb also reminds us that we need to keep learning and thinking, to keep expanding our thinking and knowledge in order to become smarter, wiser, and more capable.