This combination is the technique of "xing" in ancient poetry, that is, first say something else to cause the words to be recited, and the upper and lower sentences are not the same thing. First say a famous or obvious sentence, and then infer the next sentence by analogy, thus stimulating readers' association, enhancing the meaning of the work and forming a vivid and poetic artistic effect.
The phrase "a gentleman cooks from afar" first came from the Book of Rites. Yuzao: "A gentleman cooks far away, and all flesh and blood can be practiced." In other words, don't kill anything yourself.