“In the vacuum created by fear and ignorance and hunger and want, it's evil, not good, that rushes to fill the void.”

“How 'bout a shot of truth in that denial cocktail.”

“... you sometimes had to force people to say things they would rather not articulate, just so they could hear their own words. It was interesting the way people could know things and not know them ...”

“To regret ones own experiences is to arrest ones own development. To deny ones own experiences is to put a lie into the lips of ones own life. It is no less than a denial of the soul.”

“...sometimes it's best not to know, because even when you know, it doesn't matter anyway. Ignorance is bliss. Knowledge is often a responsibility nobody wants.”

“Ignorance is toxic. If a man hands you a cup of coffee and pours in what he calls liquid sugar when the container clearly says poison, how bliss is your ignorance?”

“I think it's better to not know certain things. It gives the world an extra bit of mystery, which is important to us as human beings.”

“The truth." Dumbledore sighed. "It is a beautiful and terrible thing, and should therefore be treated with great caution.”

“The truth is rarely pure and never simple.”

“Never tell the truth to people who are not worthy of it.”