Carl Sagan

"Science and religion are not at odds; science is simply trying to find the truth about reality."

"A scientist is someone who has trained themselves to notice things."

"The early universe was like an enormous concentration camp."

"There are probably over 100 billion galaxies in the observable universe."

"What is the difference between science and religion? In science you can change your mind when presented with evidence."

"One of the most profound experiences is to encounter genuine mystery."

"Skeptical thinking is the key to understanding the world."

"We are biochemically programmed to reject things too different or too strange."

"Somewhere in the cosmos, perhaps intelligent life is watching these lights of ours, aware of which ones have extinguished."

"The greatest engine of thought is the human mind seeking the truth."

"As far as we know, humans are the only creatures in the universe aware of the universe."

"Every star may be a sun to someone."

"Better to light a flamethrower than curse the darkness."

"Science is a collaborative process."

"The brain evolved for natural selection, not for truth."

"One cannot be deeply responsive to the world without being saddened very often."

"Science is the search for truth. It is not a tool for power, but for understanding."

"All things considered, I believe that the universe is probably best described by saying that it is weird."

"I often think of religion like a suit of clothes - important for certain occasions."

"The evidence for God is mixed at best."

"We have built a global civilization founded on science and technology."

"An atheist is someone who is certain that God does not exist, saying there is no evidence."

"What a marvelous cooperative arrangement - plants and animals each inhaling what the other exhales."

"Be wary of those who would stop the unfettered pursuit of knowledge."

"If we do not destroy ourselves, we will one day venture to the stars."

"Science has been the most effective human tool for understanding the world."

"I think if we ever reach the point where we think we thoroughly understand who we are and why we are here, we will have failed."

"In the human situation, we are the only species that is aware of time."

"Science is a way to call the bluff of those who only pretend to knowledge."

"Perhaps we will always be too immature for the stars."