The chassidim of Rabbi Schneur Zalman of Liadi used to say: Our Rebbe revives the dead. What is a corpse? Something cold and unfeeling. Life is movement, warmth, excitement. Is their anything as frozen in self-absorption, as cold and unfeeling as the mind? And when the cold mind understands, comprehends, and is excited by a G‑dly idea - is this not a revival of the dead?