“It is easier for a man to burn down his own house than to get rid of his prejudices.”

“All science requires mathematics. The knowledge of mathematical things is almost innate in us. This is the easiest of sciences, a fact which is obvious in that no one's brain rejects it; for laymen...”

“The strongest arguments prove nothing so long as the conclusions are not verified by experience. Experimental science is the queen of sciences and the goal of all speculation.”

“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.”

“When the mind wants to hope it refuses to listen.”

“Sweet are the thoughts that savour of content, The quiet mind is richer than a crown...”

“It turns out that the men who ultimately, who unpretentiously value peace are willing to sacrifice their own peace of mind in order to render it. The question is, 'Who, between opposing forces, wou...”

“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.”