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I believe we are the only sentient beings in the universe, and I believe that 500 years from now, we will still be the only sentient beings around.

"Whedon Creates Space Cowboys in 'Firefly'". Post-Gazette.com, July 22, 2002.
I believe we are the only sentient beings in the universe, and I believe that 500 years from now, we will still be the only sentient beings around.