Quote itself is a kind of rhetoric. When writing articles, deliberately quote idioms, poems, aphorisms, allusions, etc.
Expressing one's thoughts and feelings and expounding one's views on new problems and new truths is a rhetorical device called quotation.
It is meaningful and useful to quote Gu Yan's poem in your composition.
1, quoted, can make the language expressed concise, vivid and interesting.
2. Citation is very helpful for reasoning and expression, providing strong arguments for one's own views and opinions and enhancing persuasiveness.