S. L. MacGregor
Kether (Hebrew: כתר Keter, meaning “Crown”) represents the highest Sephira (singular of Sephiroth) on the Tree of Life in Jewish Kabbalah. For Kabbalists, Kether is regarded as the ultimate goal of spiritual pursuit. It is understood as pure divine being. Kether is considered so exalted that it is called the Zohar, “the Hidden of the Hidden,” completely beyond human comprehension.
Here’s the quoted passage from Dion Fortune’s The Mystical Qabalah:
"As above, so below. The microcosm corresponds to the macrocosm, and we must therefore seek in man the Kether above the head which shines with a pure white brilliance in Adam Kadmon, the Heavenly Man.
The rabbis call it the Yechidah, the Divine Spark; the Egyptians call it the Sab; the Hindus call it the Thousand-petalled Lotus. But under all these names we have the same idea—the nucleus of pure spirit which emanates but does not indwell its many manifestations upon the planes of form." ["The Kabbalah unveiled, containing the following books of the Zohar", c. 1887 by Mathers, S. L. MacGregor]
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