The song features a speech by a man named Do who was the leader of the Heaven’s Gate religious cult. This U.S. cult believed that they were from another planet and only visiting earth. In order to return to their own “dimension” before the earth was “recycled” they all committed mass suicide. The words are taken from the video they made before killing themselves to explain to the rest of the world why they had done it.
Wikipedia info on Heaven’s Gate cult.