Book excerpt: Basing his study on Jung's archetypal theory-especially that of initiation-Thresholds of Initiation represents thirty years of testing the theory in analytical practice. Joseph Henderson considers archetypes to be predictable patterns of inner conditioning that lead to certain essential changes and shows the parallels between individual psychological self-development and the rites that marked initiation in the past. Dr. Henderson's topics include the uninitiated; return of the mother; remaking a man; trial by strength; the rite of vision; thresholds of initiation; initiation and the principle of ego-development in adolescence; and initiation in the process of individuation. This is essential reading for an understanding of the universal nature of initiation, especially as it relates traditional initiatory practices to Jung's theory of archetypes.