What does Sydney do on his way to the guillotine? What are his last thoughts and visions? (From Book 3 Chapters 11-15)

Carton holds the girl's hand to the end, and she thanks him for his support.

Carton goes to the guillotine with a peaceful, philosophical face. If he could have spoken prophetically he would have foreseen the future of the people whom he knows. He would have seen Barsad, Cly, Defarge, the Vengeance, the Jury, and the Judge all dying on the guillotine which they helped raise. He would see a peaceful life for Lucie and Charles Darnay back in England, with each generation of her family, including a son named after him, blessing his name and visiting his grave. He dies with the conclusion that "It is a far, far better thing that I do than I have ever done; it is a far, far better rest that I go to than I have ever known."