Come and see the mystery of the word YHVH: there are three steps, each existing by itself: nevertheless they are One, and so united that one cannot be separated from the other. The Ancient Holy One is revealed with three heads, which are united into one, and that head is three exalted. The Ancient One is described as being three: because the other lights emanating from him are included in the three. But how can three names be one? How three can be one can only be known through the revelation of the Holy Spirit.
(Zohar, Vol. 111, 288; Vol. 11, 43 Hebrew editions; see also Soncino Press edition, Vol. 111. 134).
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Messianic Perspectives September/October 2001 p.4-5