Carl Sagan

Science cuts two ways, of course; its products can be used for both good and evil. But there’s no turning back from science. The early warnings about technological dangers also come from science.

Carl Sagan

Science is a way of thinking much more than it is a body of knowledge.

Carl Sagan

Science is a way of thinking that helps you not to fool yourself.

Carl Sagan

The absence of evidence is not the evidence of absence.

Carl Sagan

The beauty of a living thing is not the atoms that go into it, but the way those atoms are put together.

Carl Sagan

The cosmos is all there is, all there ever was, and all there ever will be.

Carl Sagan

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

Carl Sagan

The cure for a fallacious argument is a better argument, not the suppression of ideas.

Carl Sagan

The difference between physics and metaphysics is not that the practitioners of one are smarter than the practitioners of the other. The difference is that the metaphysicist has no laboratory.

Carl Sagan

The fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses.

Carl Sagan