I became intellectually challenged by Jung because there was so much in Volume Nine of The Collected Works (two parts: Archetypes of the Collective Unconscious and Aion), the first serious books by him attempted, I either couldn't understand or couldn't accept. Most of psychology, the history of religions, ancient philosophy, etc. was alien to me at that time, back in college, yet Jung also seemed to speak to me existentially, offering an avenue for understanding the phenomenology of altered states of consciousness which I'd experienced, a means by which I might relate my most bizarre personal experiences to the broader world.
Consequently, I began, in 1971, a concerted effort to get on top of what he called "analytical psychology", both by reading everything he'd written and by interrupting that lengthy process by studying works by his students, biographers and commentators. Jacobi, a close associate, was a name which came up repeatedly in the literature, so, when I'd find something by her, I'd pick it up.