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One of the first written texts in [W]estern literature, The Odyssey tells the story of the metaphoric journey “home” to the “[T]rue [S]elf.” In the story, the hero, Odysseus (the guy who thought up the “Trojan Horse”), returning home from the Trojan War, travels to nine “lands” populated with mythic creatures whose characters match the nine Enneagram types exactly—in the same order as the modern teaching!
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Christopher L. Heuertz (The Sacred Enneagram: Finding Your Unique Path to Spiritual Growth)