"Nostalgic tone" she remembers her past in a nostalgic form, she talks about when she was thirteen and her childhood in the school, this can be seen by the quote "three decades back, and me thirteen". Also, it remembers the teacher's teachings: "teaching is endless love; the poems by heart spells, the lists lovely on the learning tongue, the lessons, just as you said, for life". Here, we can see that the personae is remembering the teacher's teachings in poems. How she/he remembers the love it transmitted. The idea of "lessons, just as you said, for life", shows that it wasn't only a teacher explaining English, it was also a person who teaches their classmates to be a lovely and kind person, and this will serve for life.