 The study of the mystical experiences enabled by psychedelics (in particular, psilocybin and LSD) is now also a major topic (Barlett and Griffiths 2018). Psychedelics are reported to occasion some of the most spiritually significant experiences in the life of the participants (Doblin 1991). There is also the clinical study of psychedelics in therapy for such conditions as depression and addiction that are resistant to more conventional forms of therapy. An important issue is whether the positive effects of a psychedelic drug on a patient’s well-being are the result solely of the chemical effect of the drug on the brain or whether the mystical experiences enabled by the drugs are also a necessary part of the treatment. 