"Hasidic theological principle" . . . "Chabad Chasidic" . "Chabad philosophy" . . "mystical study of Divinity" . "Chabad Hasidic philosophy" . "Chabad texts" . "Chabad philosophy" . . "Chabad intellectual Hasidic thought" . . . . "intellectual and kabbalistic underpinnings" . "Chabad mysticism" . . . . . "Chabad" .