But is all this true?" said Brutha. Didactylos shrugged. "Could be. Could be. We are here and it is now. The way I see it is, after that, everything tends towards guesswork." "You mean you don't KNOW it's true?" said Brutha. "I THINK it might be," said Didactylos. "I could be wrong. Not being certain is what being a philosopher is all about.
Terry PratchettThe short conversation that follows eventually led to a tree religion. Its tenet of faith was this: a tree that was a good tree and led a clean decent and upstanding life could be assured of a future life after death. If it was very good indeed it would eventually be reincarnated as five thousand rolls of lavatory paper.
Terry Pratchett