"By knowing what I care about, and which of those things I care about more," Bella says.
"I don't have, like, a master list," Bella says. "With everything all outlined neat. Maybe I should, but mostly it's all scattered around between notebooks and I have the general idea memorized and know where to look for details if I can't come up with them."
"Then I notice that when I look again, and then I figure out why, and try to find out if it's going to happen again and if I want to let it."
"What I really wanted - if I was sure about what that was. Sometimes I might not be. If I was scared or mad or something, I might feel like I really wanted to do something that I'd know was a bad idea if I was thinking clearer. And then I'd have to sort of - step back and remember why I wrote what I wrote, and see if those reasons are still there, and see if I trust my brain however it's being right then."
"I care about privacy, that'd be on the list," she says with a little laugh. "That's why I wanna learn Occlumency."
"Huh. So you wouldn't care that much if somebody Legilimencied you and could see - all your memories - and what you were thinking?"
"Not just to mindread," Bella says. "I don't want to mindread anybody who doesn't want to be mindread. It's just, I can't find out how you're supposed to learn Occlumency, and I could make stuff up but I don't know how I'd tell if the stuff I was making up was even sorta right, without - testing it."