“The cosmos is within us. We are made of star-stuff. We are a way for the universe to know itself.”

“A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.”

“We are star stuff harvesting sunlight.”

“We make our purpose.”

“Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggre...”

“If it can be destroyed by the truth, it deserves to be destroyed by the truth.”

“Scenery is fine -but human nature is finer”

“As for me, I have a choice between honoring that dark life I've seen so many years moving in the junipers, or of walking away and going on with my own human busyness. There is always that choice fo...”

“Nature allows one kind to kill another, it's part of the law ... you wonder if man might not be the most savage of all creatures. He's among the few that preys on nearly every other being, that con...”

“I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettie...”

“To know the history of science is to recognize the mortality of any claim to universal truth. ”

“The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists.”

“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.”