"A traitor to be trained by a traitor. Seems fitting."

Ooooh that is hard but I think Bluestar said that right?!?!

people have probably already answered but the ghost one is matthias from six of crows :D

here's one: "one could plot violent espionage and still hope for dessert" 

"They feel safer if no one in Narnia dares to go down to the coast and look out to sea - towards Aslan's land and the morning and the eastern end of the world."

Ha, obviously it's from the Chronicles of Narnia, but does anyone know from which Chronicle?

"She spent a good deal of time sitting on the little bench in the stern playing chess with Reepicheep."

"Out here in the fairgrounds, I could understand why ancient people used to think the world was flat and the sky was a dome that closed in on top of it."

for no other reason than I Felt Like It, here is a compilation of all the quotes that haven't been guessed yet:
from Snazzycakes:
"Fear is the mind-killer"
"You are a pipe dream."
"I am the one thing you will never kill. I am hope."
from Artemis:
"If there's a magic here, it's down deep where my hands can't reach it, if you take my meaning."
The first place I can well remember was a large pleasant meadow with a pond of clear water in it."
from MorticiaTheStargazer:
"The matriarch of House Kore was running late." (Oh wait, I know this one! It's the Gilded Wolves!)
"I know too much of mud."
"The bottom of the lake tasted like mud, salt, and regret."
"I liked the feeling the moonlight gave me, as if it wasn't the opposite of day, but its underside, its private side, when the fabulous purred on my snow-white sheet like some dark cat come in from the desert." (this is Stargirl!)
from Rainbow:
"One of them found our friend the homeless guy, and they were having a serious conversation about metal angels from Mars."
"The ADHD part of me wondered, off-task, whether the rest of his clothes were made the same way."
"The boy regained his composure and held out his hand."
"And you have to flaunt the weird, my friends." '
' "I prefer the term fabulously wierd." '
" Ah, better, I thought, as I floated through the cold darkness. Now, there's something else I should be doing. . . . Oh, right. Breathing. "
" I named my camel Katrina. She was a natural disaster. "
' "... No miracle's gonna drop out of the sky to save you." A rectangle of darkness appeared in the air just above the ghost's head. Sadie dropped out of it. '
from Phoenix Tears:
"We're not meant for happiness, you and I."
from Chaser & Jay:
So, there I was, tied to an altar made from out-dated encyclopedias, about to get sacrificed to the dark powers by a cult of evil Librarians."
And now Jason was fixing me with a glare that was not the look of someone who had once helped me sound out the words of Truffula Tree."
"'Right, sure' {name} answered. 'Except we're trying to do this in a not-ending-up-dead way.'"
from Suki:
1. "Quinton, we're flying! You're just going to act like this is normal?"
2. "That's the part you remember? But that wasn't Kon Fiji. You're quoting from a bandit debating Kon Fiji."
from Scuttles:
"You could be drowned in mud, pushed off a cliff, squished by a dinosaur, zapped by a lazer, or, in the case of one aggresively realistic dating simulator I'd play, contract mad cow disease from a haphazardly run steak house. All this and more could happen to you, and the result would always be the same. First, you'd feel a warm and comforting sensation, like being zipped all the way into a sleeping bag stuffed with goose down and anesthetic."
from fallen leaf:
"one could plot violent espionage and still hope for dessert
from Amythest:
They feel safer if no one in Narnia dares to go down to the coast and look out to sea - towards Aslan's land and the morning and the eastern end of the world."
She spent a good deal of time sitting on the little bench in the stern playing chess with Reepicheep."
"Out here in the fairgrounds, I could understand why ancient people used to think the world was flat and the sky was a dome that closed in on top of it.
from me, myself and i:
"Kell wore a very peculiar coat."
"A life is all the minutes you want minus one."

"You owe me three days in the infirmary."

Harry Potter? Maybe KOTLC