Final answer:
Winston's final realization in the novel 1984 is that he loves Big Brother, indicating his complete submission to the Party's oppressive control and manipulation.
Step-by-step explanation:
In George Orwell's novel 1984, Winston's realization at the end of the book is that he loves Big Brother. This realization is tragic, signifying that the oppressive government of Oceania has ultimately succeeded in breaking his spirit and reforming his thoughts. Throughout the novel, Winston had hoped to defy the Party and pursue truth and freedom, but in the end, he succumbs to the Party's psychological manipulation and torture, resulting in his acceptance of the Party's version of reality.