The Left Hand of Darkness -
"- If it were proven that there is no God there would be no religion. But also if it were proven that there is a God, there would be no religion ... Tell me, Genry, what is known? What is sure, predictably, inevitable - the one certain thing you know concerning your future, and mine?

- That we shall die.

- Yes. There's really only one question that can be answered, Genry, and we already know the answer ... The only thing that makes life possible is permanent, intolerable uncertainty: not knowing what comes next."