I do not believe in the mystical world, the ethereal world, the world of the unseen, unknown, or whatever. There is no reason to believe in it, because we don’t perceive it. Belief comes from perception. If there’s no perception of something, we don’t believe it. Belief does not come from manufacturing ideas. There may be millions of arguments and logics set forth, saying that there is an unseen world that operates on higher levels of consciousness, a world that fulfills human concerns, punishes those who don’t believe, and so forth. But from the point of view of physics, that is unreal. I’m not going to say that there is another world. The world that we live in is the only world.