Levi ben Gershon, better known by his Latinised name as Gersonides or the abbreviation of first letters as RaLBaG, was a philosopher, Talmudist, mathematician and astronomer/astrologer.
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"Gersonides Quotes." Quotes.net. STANDS4 LLC, 2014. Web. 1 Sep. 2014. <http://www.quotes.net/authors/Gersonides>.