Interesting and well-written article from Ralph Metzner:
Shamanism, Alchemy and Yoga: Traditional Technologies of Transformation
From the most ancient times, human beings have practiced disciplines of psychospiritual transformation with devoted energy and intention. Modern systems of psychotherapy are the inheritors of three great traditions of transformation, in which the human is seen as engaged in purposive processes of exploration and integration in many realms of consciousness. In this essay I describe some of the common methods used, as well as the major metaphors for transformation.1....
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