<https://www.chabad.org/library/article_cdo/aid/1718600/jewish/Kabbalah-Chassidism-and-Jewish-Mysticism.htm>
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"Kabbalah, Chassidism and Jewish Mysticism"
<https://www.chabad.org/library/tanya/tanya_cdo/aid/3821199/jewish/Igeret-HaKodesh.htm>