“Every aspect of Nature reveals a deep mystery and touches our sense of wonder and awe. Those afraid of the universe as it really is, those who pretend to nonexistent knowledge and envision a Cosmos centered on human beings will prefer the fleeting comforts of superstition. They avoid rather than confront the world. But those with the courage to explore the weave and structure of the Cosmos, even where it differs profoundly from their wishes and prejudices, will penetrate its deepest mysteries.”

“I believe that we do not know anything for certain, but everything probably.”

“It all depends on what people you’re talking about helping. That’s the wonderful think about just about every religion on the planet – they’re all so incredibly selfish.”

“I have always strenuously supported the right of every man to his own opinion, however different that opinion might be to mine. He who denies to another this right, makes a slave of himself to his present opinion, because he precludes himself the right of changing it.”

“Religious moderation is the product of secular knowledge and scriptural ignorance.”

“Are you really surprised by the endurance of religion? What ideology is likely to be more durable than one that conforms, at every turn, to our powers of wishful thinking? Hope is easy; knowledge is hard. Science is the one domain in which we human beings make a truly heroic effort to counter our innate biases and wishful thinking. Science is the one endeavor in which we have developed a refined methodology for separating what a person hopes is true from what he has good reason to believe. The methodology isn’t perfect, and the history of science is riddled with abject failures of scientific objectivity. But that is just the point-these have been failures of science, discovered and corrected by-what, religion? No, by good science.”

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

“Reality provides us with facts so romantic that imagination itself could add nothing to them.”

“One good schoolmaster is of more use than a hundred priests.”

“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!”

“Those who can make you believe absurdities, can make you commit atrocities.”

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

“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.”

“Give me the storm and tempest of thought and action, rather than the dead calm of ignorance and faith! Banish me from Eden when you will; but first let me eat of the fruit of the tree of knowledge!”

“Don’t you believe in flying saucers, they ask me? Don’t you believe in telepathy? — in ancient astronauts? — in the Bermuda triangle? — in life after death?No, I reply. No, no, no, no, and again no.One person recently, goaded into desperation by the litany of unrelieved negation, burst out “Don’t you believe in anything?”Yes”, I said. “I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I’ll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wilder and more ridiculous something is, however, the firmer and more solid the evidence will have to be.”