Carl Sagan

You can’t convince a believer of anything; for their belief is not based on evidence, it’s based on a deep seated need to believe

Carl Sagan

You have to know the past to understand the present.

Carl Sagan

You’re capable of such beautiful dreams and such horrible nightmares…

Carl Sagan

Your god is too small for my universe.

Carl Sagan

At the extremes it is difficult to distinguish pseudoscience from rigid, doctrinaire religion.

Carl Sagan

Atheism is very stupid.

Carl Sagan

But down deep, at the molecular heart of life we’re essentially identical to trees.

Carl Sagan

By looking far out into space we are also looking far back into time, back toward the horizon of the universe, back toward the epoch of the Big Bang.

Carl Sagan

Claims that cannot be tested, assertions immune to disproof are veridically worthless, whatever value the may have in inspiring us or in exciting our sense of wonder.

Carl Sagan

Cleverly designed experiments are the key.

Carl Sagan