I'd say I don't believe in God, but I'm afraid He might hear me.

We only have to look at ourselves to see how intelligent life might develop into something we wouldnt want to meet. I imagine they might exist in massive ships, having used up all the resources from their home planet. Such advanced aliens would perhaps become nomads, looking to conquer and colonize whatever planets they can reach.

There is nothing bigger or older than the universe.

I think [contacting an alien civilization] would be a disaster. The extraterrestrials would probably be far in advance of us. The history of advanced races meeting more primitive people on this planet is not very happy, and they were the same species. I think we should keep our heads low.

What lies north of the North Pole?

The Universe in a Nutshell

I think the human race has no future if it doesn't go into space.