Tanya for the 7th of Cheshvan, ז' חשון

The Alter Rebbe will now point out that a careful reading of the passage from Raaya Mehemna reveals that it is not the laws themselves nor the study of them that are termed the Tree of Knowledge of Good and Evil. Rather, this term is applied to the actual food or other things which are prohibited or permitted and which derive their life-force from kelipat nogah—for this is the Tree of Knowledge of Good and Evil, as will soon be explained.