"We must open our eyes and see that modern civilization has become so complex and the lives of civilized men so interwoven with thelives of other men in other countries as to make it impossible to be in this world and out of it."

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Think of our DNA. In the last million years, our DNA hasn't changed at all. It's really much the same as it was in the jungle, a million, two millions years ago. But in the last 200 years, our destructive capacities have increased many, many millions of times over. Why don't we see intelligent signals from outer space? Because in all likelihood, once the civilization reaches the point our civilization has reached, it destroys itself.

— Stephen Hawking