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In page Kabbalah:

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The idea that there are ten divine sephirot could evolve over time into the idea that "God is One being, yet in that One being there are Ten" which opens up a debate about what the "correct beliefs" in God should be, according to Judaism. The early Kabbalists debated the relationship of the Sephirot to God, adopting a range of essentialist versus instrumental views.[1] Modern Kabbalah, based on the 16th century systemisations of Cordovero and Isaac Luria, takes an intermediate position: the instrumental vessels of the sephirot are created, but their inner light is from the undifferentiated Ohr Ein Sof essence.[citation needed]