[Lea shrugs, as if he hasn't thought about this basically constantly since the moment he woke up and had a chance to think about things.]

What about you? Sora's my friend too, don't get me wrong. He's a good guy. But he's not you. Look, I've had some time to think about it, and since I woke up I had some more time to think about it.

Namine was always going on about how the heart is made of chains of memory and memories make us who we are and stuff. Most Nobodies clung to our memories of our past lives because, yanno, we thought it'd make us more human. But you didn't start out with memories. Everything that was you, that made up the you who you are, is the memories we made over that year. Sora's where you came from, but he's not where you are or where you belong, and he's gotta see that too.

...whew, I made a speech, huh? Again.