Nefesh HaChayimנפש החיים
Volozhin · 1800
"The Soul of Life." Rabbi Chaim of Volozhin's sustained argument that Torah study and the performance of mitzvot have real cosmic consequences — that the human being stands at the meeting point of the divine and the created worlds, and that what happens here shapes what happens above. Nefesh HaChayim reads the Lurianic teachings into a non-Hasidic framework and remains the canonical philosophical statement of the Lithuanian yeshiva world's spirituality. It was published posthumously by his son.