“Mysticism stands for that type of religion in which there is an immediate apprehension of and communion with the ultimate reality, or God… in its purest form it involves an  intense and vivid appreciation of the unseen world, and an absorption of the self into it. This carries with it a special form of consciousness in which the usual object-subject distinction is obliterated and all is resolved into a oneness. This self, thus identified with its object, is capable of a vast range of vision and can become acquainted with ineffable things”:

W. B. Selbie, The Psychology of Religion (1924), p. 245.