#Skepticism

"Surely we cannot take an open question like the supernatural and shut it with a bang, turning the key of the madhouse on all the mystics of history. You cannot take the region of the unknown and calmly say that, though you know nothing about it, you know all the gates are locked. We do not know enough about the unknown to know that it is unknowable."

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

"I mean, you could claim that anything's real if the only basis for believing in it is that nobody's proved it doesn't exist!"

"Tell people there's an invisible man in the sky who created the universe, and the vast majority will believe you. Tell them the paint is wet, and they have to touch it to be sure."

"I will not attack your doctrines nor your creeds if they accord liberty to me. If they hold thought to be dangerous - if they aver that doubt is a crime, then I attack them one and all, because they enslave the minds of men.I attack the monsters, the phantoms of imagination that have ruled the world. I attack slavery. I ask for room -- room for the human mind."

"Liberty a word without which all other words are vain."

"I don’t believe in astrology; I’m a Sagittarius and we’re skeptical."

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