In the paper, if that sentence is a famous saying, its function is generally as follows: to demonstrate the point of view by rational argumentation, so as to make the argument more general, deeper and more convincing. Key argument

Note: if you quote famous sayings, aphorisms and authoritative data, you can enhance the persuasiveness and authority of the argument; Citing celebrity anecdotes and anecdotes can enhance the interest of the argument and attract readers to read.