What becomes increasingly obvious to winston as he reads the book o’brien gave him

Winston Smith is the the protagonist in George Orwell's dystopian novel 1984 about a Totalitarian State; Winston secretly dislikes the party he's afiliated to (The Thought Police Party of Oceania in the novel) and remains skeptical, so as he reads the book "The Theory and Practice of Oligarchical Collectivism" supposedly writen by Emmanuel Goldstein, he obviously realizes it was not written by Goldstein but by The Party of Oceania.

Explanation:

now, of course, the quality and the seasonability of these winter dreams varied, but the stuff of them remained.   they persuaded dexter several years later to pass up a business course at the state university—his father, prospering now, would have paid his way—for the precarious advantage of attending an older and more famous university in the east, where he was bothered by his scanty funds. but do not get the impression, because his winter dreams happened to be concerned at first with musings on the rich, that there was anything merely snobbish in the boy. he wanted not association with glittering things and glittering people—he wanted the glittering things themselves. often he reached out for the best without knowing why he wanted it—and sometimes he ran up against the mysterious denials and prohibitions in which life indulges.

there you go thats what we are missing