Nefesh HaChayim, Reb Itzele's Long Annotation

And during the time interval that his other good elements that are within him are hidden, and the supernal roots that surround him haven’t transmitted their influence to the interior, there’s the possibility that the powers of evil can dominate him (heaven forefend). (As we know from the Etz Chayyim, the place of the root of the domination of the side of evil is between the interior aspects and the surrounding ones.) “Let one who is a wild ass be reborn as a man” (Iyyov 11:12)— From the perspective of the four living beings479Heb.: chayyot that trample, in impurity, the four humors—white humor, red humor, yellow humor, black humor—which correspond to the pure elements”, as discussed previously in the Ra’aya M’hemna (Pinkhas 234b).