The lower level of kavanah is that which stems from an arousal of the soul’s natural, instinctive love and fear of G-d. Such kavanah is comparable to the soul of an animal, which is ruled by its natural instincts.

The Alter Rebbe now opens ch. 39 by stating that for this reason, the angels, who fear and love G-d by their very nature, are metaphorically called “animals.”