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In page Kabbalah:

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The thought of Kabbalist and medieval rabbinic sage Nachmanides (13th century), an opponent of Maimonidean rationalism, provided background to many Kabbalistic ideas. The book Gevuras Aryeh, authored by Yaakov Yehuda Aryeh Leib Frenkel and originally published in 1915, sought to explain and elaborate on the Kabbalistic concepts addressed by Nachmanides in his commentary on the Torah.[citation needed]