Aion, a major work from Jung's later years, has long been a source of fascination for a wide variety of scholars and thinkers. Presented here are two substantial commentaries concerning this rich and complex text by two important figures in Jung's life and work: Barbara Hannah and Marie-Louise von Franz. This is the first volume in a series edited by Emmanuel Kennedy-Xypolitas, "Polarities in the Psyche," focusing on the broad theme of the opposites in the psyche. The next volume is "The Archetypal Symbolism of Animals."

Hannah delivered these lectures at the C. G. Jung Institute in...