Let me end with an ...

Let me end with an explanation of why I believe the move into space to be a human imperative. It seems to me obvious in too many ways to need listing that we cannot much longer depend upon our planet's relatively fragile ecosystem to handle the realities of the human tomorrow. Unless we turn human growth and energy toward the challenges and promises of space, our only other choice may be the awful risk, currently demonstrable, of stumbling into a cycle of fratricide and regression which could end all chances of our evolving further or of even surviving.
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 Gene Roddenberry

Quotes from the same author

The human race is a remarkable creature, one with great potential, and I hope that 'Star Trek' has helped to show us what we can be if we believe in ourselves and our abilities.
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 Gene Roddenberry
The strength of a civilization is not measured by its ability to fight wars, but rather by its ability to prevent them.
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 Gene Roddenberry
PICARD: There is no greater challenge than the study of philosophy. WESLEY: But William James won't be in my Starfleet exams. PICARD: The important things never will be. Anyone can be trained in the mechanics of piloting a starship. WESLEY: But Starfleet Academy PICARD: It takes more. Open your mind to the past. Art, history, philosophy. And all this may mean something.
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 Gene Roddenberry
Why are we now going into space? Well, why did we trouble to look past the next mountain? Our prime obligation to ourselves is to make the unknown known. We are on a journey to keep an appointment with whatever we are.
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 Gene Roddenberry
...nuclear warfare is not necessary to cause a breakdown of our society. You take a large city like Los Angeles, New York, Chicago-their water supply comes from hundreds of miles away and any interruption of that, or food, or power for any period of time, you're going to have riots in the streets. Our society is so fragile, so dependent on the interworking of things to provide us with goods and services, that you don't need nuclear warfare to fragment us anymore than the Romans needed it to cause their eventual downfall.
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 Gene Roddenberry