[Surprised Jean got her anything or surprised he got her something she actually likes...]
you should read it
[She'd always listened to Armin and Eren's dreams about the world outside, but she'd hardly pursued the matter on her own. This, though. Unless he'd gotten it wrong, it's something she's actually interested in, seeks out. (And this may be him trying to encourage that—pursuing her own interests, things she does for her own sake.)]
no subject
you should read it
[She'd always listened to Armin and Eren's dreams about the world outside, but she'd hardly pursued the matter on her own. This, though. Unless he'd gotten it wrong, it's something she's actually interested in, seeks out. (And this may be him trying to encourage that—pursuing her own interests, things she does for her own sake.)]