"I think we overrate ourselves in terms of our abilities and capacities. I mean, just because you can build a really swell bridge doesn't, to my way of thinking, mean that you're an advanced civilization."

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Life on earth is hard. Competition for the necessities of life is fierce. How ridiculous to believe that the law of harsh survival would not be true elsewhere, or that it would be negated by the progress of technology in an advanced civilization.

— Greg Bear