יוֹם כִּפּוּר

Yom Kippur is the totality of all the days of the year [כְּלָלִיּוּת כָּל יְמוֹת הַשָּׁנָה] — for this day enlivens all the days of the year. And through the holiness of Yom Kippur the heart is rectified — that is, one's will and desires will be only for Hashem, may He be blessed. And through this all manner of strife — both materially and spiritually — is nullified, and peace is made. And through this joy flows to the person.

On Yom Kippur is the completion of the rectification of the seal of holiness [גְּמַר הַתִּקּוּן שֶׁל חוֹתָם דִּקְדֻשָּׁה] — that is, rectification of the bris. That is: if a person engages from Rosh HaShanah until Yom Kippur in fear, repentance, and good deeds as it should be — through this he merits on Yom Kippur to great holiness: the rectification of the bris, which is the greatest holiness. For through the holiness of the rectification of the bris one can arrive at all good character traits and good deeds. And the primary rectification of the bris is the purification and rectification of the mind and thought — that is, not to think evil thoughts, whether of sexual immorality or of other evil lusts — but always to think good thoughts of fear of G-d and simple faith without any alien wisdoms and inquiries. All of this is explained in Likutay Halachos.

In proportion to how much one accomplishes the Slach Na [סְלַח נָא] ["Please forgive"] on Yom Kippur — so does one merit the holiness of Chanukah. And Chanukah alludes to chanukas habayis [חֲנֻכַּת הַבַּיִת] — "dedication of the house" — which is the language of education [חִנּוּךְ] and renewal [הִתְחַדְּשׁוּת]. That is: renewal in genuine knowledge. For genuine knowledge is the very essence of the Temple, as stated in the words of our Sages, of blessed memory : "Whoever possesses knowledge — it is as if the Temple was built in his days." That is: one who possesses genuine knowledge — it is as if the Temple was built in his days. For as stated: the very essence of the Temple is genuine knowledge.

The reason the day after Yom Kippur is called "the Name of Hashem" ["שֵׁם ה'"] is because on Yom Kippur Hashem, may He be blessed, forgives the iniquities of Israel. And through the forgiveness of iniquities the children of Israel are saved from all manner of punishments and all manner of evil decrees — and through this the Name of Hashem is greatly magnified. Because of this the day after Yom Kippur is called "the Name of Hashem."