Using "gently" at the beginning and "quietly" at the end of a poem is just repetition? why

Seeing your question, Farewell to Cambridge appeared in my mind. To be sure, using "gently" at the beginning and "quietly" at the end is definitely not a fear of repetition, but an expression of emotion. As can be seen from the title, bidding farewell to Cambridge means returning to Cambridge again and then leaving. The word "gently" is used at the beginning. The author is immersed in the past life on the edge of Cambridge and can't bear to break the good memories in his heart. At the same time, he dared not touch his deep nostalgia. Contradictory, he wrote down the tenderness of my leaving/just as I gently came/turned and waved goodbye to the western clouds, and his inner disappointment made him unbearable. From the river to the bottom and then to my own mood, my mood gradually stagnated, and I got Cambridge's response-the grass swayed, the boat propped up and sang. However, this is only the author's subjective imagination. Calm down, disillusioned, he wrote: I left quietly/just as I came quietly/waved my sleeves/quietly didn't take away a cloud, which shows the author's inner loss and melancholy that he had to leave. He can't stand it.