I absolutely love the setup here. It all shows a thematic working of trying to fulfill multiple roles and multiple albeit conflicting personas in order to best integrate into society and a situation and the clash between these aspects of the "self." He's reading a book that isn't considered masculine and so she helps him works through this clash by quoting a passage from it about the harmony between two worlds that seem separate. This internal struggle of his to fit the world and all the conflicting aspects of the roles he's been prescribed parallels her Dissoicative Identity Disorder and sets up why the two are drawn two one another as characters, both of whom feel unsatisfied with one role being forced upon them.
It's brilliant as a setup to what's to come and shows a complex understanding of the themes the author wants to carry through in his work.