Carl Sagan
No other planet in the solar system is a suitable home for human beings; it's this world or nothing. That's a very powerful perception.
More quotes and aphorisms
If you want total security, go to prison...If I had some idea of a finish line...I must study politics and war...As you grow older, you will discover that you have...Your competition is not other people but the time...The future belongs to those who prepare for it today...
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