Sunday Sermonette II
[T]he ontological arguer who says that his world is special because his world alone is the actual world is as foolish as a man who boasts that he has the special fortune to be alive at a unique moment in history: the present...
It is true of any world, at that world but not elsewhere, that that world alone is actual. The world an ontological arguer calls actual is special only in that the ontological arguer resides there --- and it is no great distinction for a world to harbor an ontological arguer. Think of an ontological arguer in some dismally mediocre world --- there are such ontological arguers --- arguing that his world alone is actual, hence special, hence a fitting place of greatest greatness, hence a world wherein something exists than which no greater can be conceived to exist. He is wrong to argue thus. So are we.
---David Lewis, "Anselm and Actuality"