“One should cultivate good habits of memory, for it is capable of making existence a Paradise or an Inferno.”

“Never compete with someone who has nothing to lose.”

“Friendship multiplies the good of life and divides the evil.”

“True friendship multiplies the good in life and divides its evils. Strive to have friends, for life without friends is like life on a desert island... To find one real friend in a lifetime is a goo...”

“Though such authority and respect shouldn't be handed to all and sundry, have in caution's innermost room a confidant, a faithful mirror, whose correction you value when disillusionment is necessary.”

“The truths that matter most to us come always half spoken.”

“Look, it's easy to outsmart a werewolf or a vampire," Jace said. "They're no smarter than anyone else. But faeries live for hundreds of years and they're as cunning as snakes. They can't lie, but t...”

“You may plainly perceive the traitor through his mask; he is well known every-where in his true colors; his rolling eyes and his honeyed tones impose only on those who do not know him. People are a...”

“One must be cunning and wicked in this world.”

“I am convinced that human life is filled with many pure, happy, serene examples of insincerity, truly splendid of their kind-of people deceiving one another without (strangely enough) any wounds be...”

“Religion is like a blind man looking in a black room for a black cat that isn't there, and finding it.”

“Over time, hidden truths morph in the dark soil of deceit into something much worse.”

“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.”