Likutei Moharan 57:6/ליקוטי מוהר"ן נ״ז:ו׳

16. By fasting, a person’s enemies fall before him, because through the anger that stems from the liver—the aspect of “the liver is angry” (Berakhot 61b)—the great accuser is aroused. This is Esav, EDoM, whose place is in the liver; and he is “ӔDMoni (the Red One),” for he is the aspect of the liver, which is full of DaM (blood).

2From this highest accuser, accusers are aroused that devolve below and oppress a person who gets angry. They rule over him and are not afraid of him, since because of the anger he appears to them to be an animal, in the aspect of (Psalms 49:13, 21), “likened to the beasts, who are cut off.” For in the main, the fear a human being instills—in the aspect of “a fear and a dread of you” (Genesis 9:2)—is due only to the image of God in the human face. By virtue of this image, a human being is a human being. Thus, when the image is removed, he then goes from the category of human being to the category of animal, and so the fear he instills is removed.

3The essence of the image that illuminates a person’s face is the wisdom of the Creator, which He gave to human beings as an advantage over the animals. It illuminates the face of a human being, in the aspect of “A man’s wisdom illuminates his face” (Ecclesiastes 8:1). But because of the anger, if he is wise, his wisdom departs. Then his image departs, and his face falls, in the aspect of “Why are you so furious? Why is your face fallen?” (Genesis 4:6). And when he lacks the face of a human being, the fear he instills departs, because he is “likened to the beasts,” and his adversaries oppress him.

4But by means of fasting he rectifies his face and reinstates his wisdom, which is his image that illuminates his face. The everyone fears him, and his enemies fall lephanav (before him)—specifically lephanav, since in the main their fall is because of the panim (face), as mentioned above.

5All this happens by means of fasting, because by fasting the liver is made subservient to the mind. On a day that a person eats, the liver is nourished first, and afterwards it sends to the mind. Thus it is that on a day of eating, prominence and rule belong to the liver. But when one fasts, then the mind is nourished first, and afterwards the mind sends food to the liver. Thus it is that on a day of fasting the liver is subservient to the mind, and the prominence and rule belong to the mind.

6This is a rectification for his having initially blemished wisdom, which is the mind, the image that illuminates his face. Now, by means of fasting, he subdues the liver and gives the mind rulership. And when the liver, the chief accuser, is subdued, then all the enemies that are connected with the liver are subdued.

7Hence, the letters TZOM are an acronym for “Vekhatoti Mepanav TZarav (I will thrash his adversaries from before him)” (Psalms 89:24) . By means of fasting, the liver is subdued, and the mind of wisdom, the image, is rectified and illuminates a person’s face. By means of the image in panav (his face), “I will thrash his adversaries mepanav (from before him)”—specifically from his panav, as mentioned above.

8But when a person merits the aspect of the delight of Shabbat, as mentioned above, then he has no need to fast, because he accomplishes with his eating what he accomplished by fasting—i.e., “lehaShBiT enemy and avenger.” For ShaBbaT eating is holy, and “no stranger may eat of the holy” (Leviticus 22:10). {“All wrathful dominions and bearers of judgments—they all flee and depart from her, and there is no ruling power [but she] in all the worlds. Her face glows with heavenly lights” (Zohar II, 135b).}

9Then the liver is subdued and its power eliminated, in the aspect of “all wrathful dominions”—these are the aspect of “the liver is angry”—”they all flee and depart,” {so that the mind of wisdom grows great and illuminates the face, in the aspect of “Her face glows with heavenly lights.”}

10Then, all is love, in the aspect of “O love of delight” (Song of Songs 7:7). All this is from the above mentioned delight of Shabbat.