"I have a really good metaphor for it but it'd probably just sound neat to you," says Kiri.
"No, I mean, like..." There is something he means but he doesn't know how to say it.
"I dunno. Kiri's smarter than me," he volunteers; this seems relevant.
"...I dunno. What if she memorized me like a book, then what?"
"If I what? I can't do that. That isn't how people work."
"Because... people don't even have themselves memorized," he says. "You can't. There's parts of you that haven't happened yet. And I don't know about you, but even if Kiri followed me around every day of my life taking notes, I bet she still couldn't - say my entire half of a conversation for me, or know what I think of somebody's clothes without checking."
"I mean, if I could memorize a whole person like a book I'd've done it to myself by now."
Kiri snorts. "Far as I know most people don't care about it. I do though."
By which he means: if Kiri wants to memorize herself like a book, she wants the opposite of the kind of self-knowledge that the prince has and is pleased about. If it were somehow possible to know himself so perfectly well that he could never again have a moment of realizing what he's going to do only after he has decided to do it - and he doubts it could be possible, however many sweela primes might try it - there would go much of the appeal of continuing to live. Surprise is one of his birth blessings for a reason.