Musar su Genesi 49:22

Immediately afterwards the Torah mentions the prohibition of shaving off corners of one's beard seeing that imitating pagan practices has been forbidden. One must not destroy the very symbols representing the emanation חד. This is a profoundly mystical aspect to which I have already alluded when discussing Genesis 49,22: בן פורת יוסף, where we discussed the mystical dimension of man's features, that the hair alludes to divine forces found in אדם העליון, the Celestial equivalent of terrestrial Man. Some of these are spiritual outgrowths of the attribute of חסד, whereas others are outgrowths of the attribute of דין. The former are the ones that one must not destroy by shaving them off. This is the mystical dimension of the injunction in 21,5 that: לא יקרחה קרחה בראשם, "The priests must not make bald spots on their heads (in mourning for someone who died). The priests, who more than anyone, originate in the emanation חסד, are forbidden to do this, whereas the Levites who originate in the emanation גבורה, are on occasion even instructed to shave off all the hair on their bodies (Numbers 8,7) in order to weaken the forces of דין. We observe that Gentiles, especially their clergymen, who are the recipients of abundant influences from the emanation גבורה, i.e. the attribute of Justice, and upon whom the spirit of impurity rests, make a point of destroying the hair around the corners of their beards, even though they act like a blind man looking for a window [they do not realize the mystical dimension of what they are doing. Ed.]. Similar considerations are at the root of the prohibition to inflict tattoos on one's flesh (19,28). Once you understand this you realize the reason that women are not subject to the injunctions not to shave off the hair on their heads. They are comparable to the Levites.