e of a character named Charles Darnay. Lucie is described as the "golden thread" that connects Darnay to his past and present. And her presence in his life has a positive and comforting effect on him.

First, when Dickens says Lucie is the "golden thread" that unites Darnay with his past. He thinks of her as a link to his history and family. Darnay has a troubled past filled with secrets and hardships. Lucie represents a connection to a time before all the suffering began. She brings a sense of continuity and stability to his life. She Reminds him of happier times. Second, Lucie is also a source of comfort in Darnay's presence. Her voice, face, and touch strongly impacted him. He feels better whenever he is with her or even thinks about her. She provides emotional support and love. She helps him to face the challenges and difficulties he faces in his life. Lucie is like a ray of sunshine in Darnay's life. It reminds him of better days and strengthens him to face the present. 

In short, the quote emphasizes the love and companionship of Lucie Manette. It shows the power of love to bring hope and happiness in difficult times and to provide healing and comfort.