Why is John Stuart Mill so concerned about argunig in favor of qualitative differences among pleasures

I need help with a Philosophy question. All explanations and answers will be used to help me learn.

Why is Mill so concerned about arguing in favor of qualitative differences among pleasures? How does he use this distinction in his argument in favor of the claim that the virtuous life is superior to simply leading the most pleasant life, which would seem to be what utilitarianism supports?

That is the question that needs to be answered in a 500 word paper. You after to portray what Mill was trying to explain without using his exact words and no in text citations. The reading is from my ethics book. I don’t have a pdf. But I can upload the few pages needed to answer this question.

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