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In page Monism:

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According to Maimonides,[1] God is an incorporeal being that caused all other existence.[citation needed] According to Maimonides, to admit corporeality to God is tantamount to admitting complexity to God, which is a contradiction to God as the first cause[citation needed] and constitutes heresy. While Hasidic mystics considered the existence of the physical world a contradiction to God's simpleness, Maimonides saw no contradiction.[note 3]