What is mysticism?

In the last fifty years, mystical theology has become a common type of discussion and research, largely as a result of the developments in European schools of psychology. Most studies have concentrated their efforts on an empirical and existential interpretation of the mystical experience, rather than a spiritual one. The author takes a somewhat different approach in this book. The two main purposes of his study are to explain the nature of the mystical experience by showing what it has in common with the Christian theology of grace; and to show the similarity of the Christian and non-Christian mystical experiences.