Two possibilities exist - either we are alone in the Universe or we are not.

“Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.”

~Arthur C. Clarke
It has yet to be proven that intelligence has any survival value.

“It has yet to be proven that intelligence has any survival value.”

~Arthur C. Clarke

“The limits of the possible can only be defined by going beyond them into the impossible.”

~Arthur C. Clarke

“I'm sure the universe is full of intelligent life. It's just been too intelligent to come here."

~Arthur C. Clarke