Ada expresses a determination to leave behind vulgarity, emphasizing a commitment to a singular focus in her life. She highlights the idea that she has only one love, one source of suffering, and one source of happiness. This statement reflects her profound emotional journey and connection to a central person or experience that shapes her existence.

The intensity of Ada's feelings underscores the themes of devotion and longing present in Nabokov's work. Through this quote, the author illustrates how the complexities of love and life are intertwined, suggesting that despite the challenges, there is beauty and depth in such singular attachments.