Hunter Thompson said the great fallacy of LSD culture in the '60s was the false impression that "someone or something was tending the light at the end of the tunnel". I think this song is about a guy who, like a lot of naeive LSD users, foolishly thinks that he is 'special' and has been chosen by some mysterious, intelligent entity (which is nothing more than a product of his own mind) to deliver a message to humanity. In reality, he's just a guy who's tripping his balls off like anyone else.