Musar su Isaia 30:20

ופניהם איש אל אחיו, "their faces facing each other." This is an allusion to the saying that one should face one's teacher.

When the Gentiles count according to the solar calendar, the sun represents this "fire." At some state in the future G–d will denude the sun of its sheath [remove its potentially destructive force. Ed.] (Kohelet Rabbah 1,5), something He does not have to do with the moon because the moon is only אור, light, has no potentially lethal side-effects. We find this fact mentioned in this same Midrash. Just as the sun is made of fire, so the Gentiles will be judged in fire in the future as we know from Maleachi 3,19: "For lo! the day is at hand, burning like an oven. All the arrogant and all the doers of evil shall be straw, etc." Just as the moon is made up of light, so Israel will inherit light, as we know from Psalms 97,11: "Light is sown for the righteous, joy for the upright." Isaiah 60,1 also says: "Rise and shine, for your light has arrived." Now we understand the second part of the Midrash which described the "big one" as counting according to the big luminary. The "big one" is none other than the firstborn Esau. He is not referred to as the "firstborn" since the sanctity belonging to the firstborn belongs to Jacob. Esau can only be referred to as the "big one," not as the "firstborn." The bigness of Esau refers to the preponderance of the body in his personality. When the body is burned the result is חושך, darkness, the very opposite of אור, light. The holiness of Israel by comparison is twofold, predominance of mind and soul, and light. There is a similar twofold sanctity which G–d has granted us through the gift of the Torah; it is described by our sages as אחת דיבר ושתים זו שמענו, "G–d spoke one thing whereas we heard two." One element of such sanctity is the individual commandment described by Solomon as נר מצוה, the other is תורה אור, the comprehensive understanding of the totality of Torah, something which will be granted us in Messianic times. At that time the vision of Isaiah 30,20: "Your eyes will behold your Guide," will be fulfilled.