“Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it.”

“I suppose therefore that all things I see are illusions; I believe that nothing has ever existed of everything my lying memory tells me. I think I have no senses. I believe that body, shape, extens...”

“Except our own thoughts, there is nothing absolutely in our power.”

“I desire to live in peace and to continue the life I have begun under the motto 'to live well you must live unseen”

“Let whoever can do so deceive me, he will never bring it about that I am nothing, so long as I continue to think I am something.”

“although we very clearly see the sun, we ought not therefore to determine that it is only of the size which our sense of sight presents; and we may very distinctly imagine the head of a lion joined...”

“I am all in a sea of wonders. I doubt; I fear; I think strange things, which I dare not confess to my own soul.”

“If you take too long in deciding what to do with your life, you'll find you've done it.”

“Fear and doubt are major stampeders.”

“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.”