To the student of the recent history of theological ideas in the West, it sometimes seems as though, of all the ‘new’ subjects that have been intro duced into theological discussion during the last hundred or so years, only two have proved to be of permanent significance. One is, of course, biblical criticism, and the other, the subject which in my University is still called ‘comparative religion’—the dispassionate study of the religions of the world as phenomena in their own right.