He hitched out of his chair, made coffee, gave Carol a cup, and talked on, half defiant and half apologetic, half wistful for friendliness and half amused by her surprise at the discovery that there was a proletarian philosophy.
Do you want to sacrifice yourself in such a topsy-turvy world, where popularity makes you unpopular with the people you love, and the only failure is cheap success, and the only individualist is the person who gives up all his individualism to serve a jolly ungrateful proletariat which thumbs its nose at him?
There are no more uses of "proletariat" in the book.
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Marx did not envision a generally satisfied proletariat that found meaning and financial reward in their work.
Marx expected the proletariat to rise in rebellion.