 Various philosophers have defended the evidential value, to one degree or another, of some religious and mystical experiences, principally with regard to experiences of God (see Baillie 1939, Broad 1953, Davis 1989, Gellman 1997 and 2001a, Gutting 1982, Swinburne 1991 and 1996, Wainwright 1981, Yandell 1993). These philosophers have stressed the “perceptual” nature of experiences of God. This approach can be summarized as follows: