We are all star stuff. - Carl Sagan

"You could just as well say that an agnostic is a deeply religious person with at least a rudimentary knowledge of human fallibility."

"Who is more humble? The scientist who looks at the universe with an open mind and accepts whatever the universe has to teach us, or somebody who says everything in this book must be considered the literal truth and never mind the fallibility of all the human beings involved?"

"La prueba de ausencia no es prueba de ausencia"

"The idea that God is an oversized white male with a flowing beard, who sits in the sky and tallies the fall of every sparrow is ludicrous. But if by 'God,' one means the set of physical laws that govern the universe, then clearly there is such a God. This God is emotionally unsatisfying... it does not make much sense to pray to the law of gravity."

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