The JWs used to say that everyone will know about the 'Truth' - and then the end will come.
Years after, I had a little flashback to this when reading one of the offshoots from Douglas Adams' 'Hitchhiker's Guide ...'. A character called Bowerick Wowbagger becomes immortal by accident. To relieve his boredom, he sets about visiting every creature in the universe, in alphabetical order, and insulting them. Due to creatures being born regularly, his task is impossible.
Sound familiar? :)