"But we know that freedom cannot be served by the devices of the tyrant. As it is an ancient truth that freedom cannot be legislated into existence, so it is no less obvious that freedom cannot be censored into existence. And any who act as if freedoms defenses are to be found in suppression and suspicion and fear confess a doctrine that is alien to America."

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I suspect that religion is a necessary evil in the childhood of our particular species. And that's one of the interesting things about contact with other intelligences: we could see what role, if any, religion plays in their development. I think that religion may be some random by-product of mammalian reproduction. If that's true, would non-mammalian aliens have a religion?

— Arthur C. Clarke