Does Dr. Manette now seem to be a stronger or weaker man than before? What has brought on this change? (From Book 3 Chapters 6-10)

Instead of reviving his old psychological problems, the Doctor's activities give him a sense of importance and help him become more confident. He has used his influence to ensure that Darnay is not imprisoned alone but with others, and he has seen Darnay weekly to check on his health and convey messages from him to Lucy.