In Vladimir Nabokov's novel "Lolita," the character expresses a deep, possessive affection for Lolita, symbolized by the repeated insistence that she was "mine." This phrase underscores the intensity of his emotions and the complexity of his relationship with her. The imagery of holding a key tightly in his fist suggests a sense of control and ownership that he feels, reflecting the troubling dynamics of desire and possession that permeate the narrative.

The repetition in the quote emphasizes the character's fixation and the conflation of love with possession. By stating that "the key was in my fist," he conveys a sense of authority over Lolita, while also highlighting the secretive and hidden nature of their relationship, as his fist is tucked into his pocket. This encapsulates the dark nature of obsession showcased in the book, revealing the protagonist's inner turmoil and the moral ambiguities at play.