book 2 chapter 10 "two promises": How does Dr. Manette react to Darnay's wish to marry Lucie?

He wants to learn to trust Darnay. Darnay wants to tell Manette who he really is, but Manette says that he will learn Darnay's true identity if his attempt to court Lucie is successful. The revelation will occur on the wedding day if it happens.