Glenn used to say the reason you can't really imagine yourself being dead was that as soon as you say, "I'll be dead," you've said the word I, and so you're still alive inside the sentence. And that's how people got the idea of the immortality of the soul - it was a consequence of grammar. And so was God, because as soon as there's a past tense, there has to be a past before the past, and you keep going back in time until you get to I don't know, and that's what God is.
Margaret Atwood, The Year of the Flood