The purpose of this article is to evaluate Rudolf Otto's account of the relationship between numinous experience and religious language in The Idea of the Holy, and this will inevitably also involve some more general discussion of the relationship between all religious experience and discursive reason. In The Idea of the Holy Otto makes a number of controversial claims about the nature of numinous experience and the problems which it creates for anyone wishing to speak about it. Numinous experience, Otto asserts, is qualitatively quite unlike any other experience. It is a religious feeling providing a unique form of religious knowledge inaccessible to our ordinary rational understanding. It is frequently spoken of as ineffable. Moreover because it resists literal description, it must be approached, if at all, then indirectly through analogy. At the heart of this collection of claims about numinous experience is an epistemological assumption about the distance separating religious language and experience. Otto believes that the parameters of numinous experience extend beyond the parameters of religious language, and consequently that it is possible to compare religious experience with language about it in a straightforward way. Indeed, much of The Idea of the Holy is devoted to the struggle of religious experience to cast off what Otto sees as its imprisonment by inadequate religious language.

Rudolf Otto has often been criticized for not showing enough interest in mystical experience. In this article I want to demonstrate how misplaced this criticism is and to show that it is based on an erroneous interpretation of the relationship between numinous and mystical experience in his work by most of his students. I shall argue that, particularly in The Idea of the Holy, Otto offers an account of the nature of mystical experience which should be of considerable interest to students of mysticism today, not least because it calls into question many of the assumptions that are presently made about mysticism by phenomenologists and philosophers of religion. Most of this article will be devoted to an examination of references to mysticism in The Idea of the Holy and to an evaluation of Otto's observations about the nature of mystical experience, and I shall conclude that Otto's account of the relation-ship between mystical and devotional forms of religion provides a significant, but frequently overlooked, insight into the nature of mystical experience.