i am coming to understand that roland 's world ( or worlds ) actually contains all the others of my making ; there is a place in mid-world for randall flagg , ralph roberts , the wandering boys from the eyes of the dragon , even father callahan , the damned priest from 'salem 's lot , who rode out of new england on a greyhound bus and wound up dwelling on the border of a terrible mid-world land called thunderclap .