“Perhaps in time the so-called Dark Ages will be thought of as including our own.”

“The Greeks possessed a knowledge of human nature we seem hardly able to attain to without passing through the strengthening hibernation of a new barbarism.”

“What is the good of drawing conclusions from experience? I don't deny we sometimes draw the right conclusions, but don't we just as often draw the wrong ones?”

“Never undertake anything for which you wouldn't have the courage to ask the blessings of heaven.”

“The pleasures of the imagination are as it were only drawings and models which are played with by poor people who cannot afford the real thing.”

“We have no words for speaking of wisdom to the stupid. He who understands the wise is wise already.”

“The land of easy mathematics where he who works adds up and he who retires subtracts.”

“At the age of 45, most days in Tucson were spent feeling like I was on the summit of Mauna Kea, as I was exhibiting debilitating health symptoms that corresponded to what I saw at very high altitud...”

“The hour is only long thus, if you've waited.”

“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.”

“At the end of the day the only thing that stays are your words. They linger while you disappear. Hanging in the air like they're on a clothesline, oh how I wish I could let them go.”

“Only wise men look for new wisdom.”

“This person has just arrived on this planet, knows nothing about it, has no standards by which to judge it. This person does not care what it becomes. It is eager to become absolutely anything it i...”