“Sit down before fact as a little child, be prepared to give up every preconceived notion, follow humbly wherever and to whatever abysses nature leads, or you shall learn nothing. I have only begun ...”

“The scientific spirit is of more value than its products, and irrationally held truths may be more harmful than reasoned errors.”

“What we call rational grounds for our beliefs are often extremely irrational attempts to justify our instincts.”

“With theology as a code of dogmas which are to be believed, or at any rate repeated, under penalty of present or future punishment, or as a storehouse of anaesthetics for those who find the pains o...”

“I am too much of a skeptic to deny the possibility of anything.”

“From the dawn of exact knowledge to the present day, observation, experiment, and speculation have gone hand in hand; and, whenever science has halted or strayed from the right path, it has been, e...”

“The race is now on between the technoscientific and scientific forces that are destroying the living environment and those that can be harnessed to save it. . . . If the race is won, humanity can e...”

“None can reply - all seems eternal now. The wilderness has a mysterious tongue, which teaches awful doubt.”

“When Mother Nature speaks, even the Gods hold silence.”

“I have to convince myself every night that I love you before I go to sleep lest I wake up empty.”

“...nothing in the world is harder than convincing someone of an unfamiliar truth.”

“The creature who lives inside my brain suggested I do it, I offered tentatively. It was very convincing.”