What is the purpose of quoting the poem praising Zhuge Liang in the third paragraph of the first volume of the ninth grade book "Three Visits to the Thatched Cottage"

The third paragraph of "Three Visits to the Thatched Cottage" in the first volume of the ninth grade quotes a poem praising Zhuge Liang, which serves to exaggerate the image of Zhuge Liang, the protagonist of the novel, as a hermit with high moral integrity and elegant equipment, and pave the way for Zhuge Liang's appearance. The reader does not see Zhuge Liang in the layers of rendering, but has a general understanding in his heart, and gradually develops a sense of mystery and urgency in the blur. The author takes his time and narrates Uncle Liu's three visits to the thatched cottage in an orderly manner, and then introduces Zhuge Liang after whetting the reader's appetite. Zhuge Liang was understated through Liu Huangshu's eyes, and "Longzhong Dui" lived up to expectations.