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The importance of Jung’s discovery bears considering. Since the seventeenth century, we’ve been taught that what is “in our heads” is only “subjective,” that we are all island universes, separate worlds, and that everything in those worlds has been furnished with material taken from outside, from the senses, as if our minds began as empty rooms, waiting for the mental equivalent of a trip to Ikea. Yet anyone, like myself, who has had precognitive dreams or experienced synchronicities or telepathy or other “paranormal” phenomena knows this isn’t quite true. Jung knew this and is saying that there are things in our heads that have nothing to do with us or our senses. In his book Heaven and Hell Aldous Huxley made the same point. “Like the earth of a hundred years ago,” Huxley wrote, “our mind still has its darkest Africas, its unmapped Borneos and Amazonian basins.” And while the creatures that inhabit these “far continents” of the mind seem “improbable,” they are nevertheless “facts of observation,” which argues for their “complete autonomy” and “self-sufficiency.”18 Huxley borrowed the title of his book from another extraordinary inner explorer, the Swedish sage Emanuel Swedenborg, who was a powerful influence on Jung, and who, like Jung, was a practiced hypnagogist and developed a method of entering similar inner worlds.
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Gary Lachman (Jung the Mystic: The Esoteric Dimensions of Carl Jung's Life & Teachings)