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In page Kabbalah:

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The Kabbalist medieval rabbinic sage Nachmanides (13th century), classic debater against Maimonidean rationalism, provides background to many kabbalistic ideas. An entire book entitled Gevuras Aryeh was authored by Yaakov Yehuda Aryeh Leib Frenkel and originally published in 1915, specifically to explain and elaborate on the kabbalistic concepts addressed by Nachmanides in his classic commentary to the Five books of Moses.[citation needed]