On Kislev 21 of the year 3448 from creation (313 BCE), there occurred the historic meeting between Shimon HaTzaddik and Alexander ('the Great") of Macedonia. (Source: Megillat Taanit)
The Samarians, bitter enemies of the Jews, had convinced Alexander that the Jews' refusal to place his image in their Temple was a sign of rebellion against his sovereignty, and that the Holy Temple should be destroyed. The Kohen Gadol ("High Priest") at the time was Shimon HaTzaddik, the last of the "Men of the Great Assembly" who rebuilt the Holy Temple and revitalized Judaism under Ezra. On the 21st of Kislev Alexander marched on Jerusalem at the head of his army; Shimon, garbed in the vestments of the High Priest and accompanied with a delegation of Jewish dignitaries, went forth to greet him. The two groups walked towards each other all night; at the crack of dawn they met. As Alexander beheld the visage of the High Priest, he dismounted his horse and bowed respectfully; to his men he explained that he often had visions of a similar-looking man leading him into battle. Shimon HaTzaddik brought the emperor to the Holy Temple and explained that Judaism prohibits the display of any graven image; he offered to name all the male children born to priests that year "Alexander" as a demonstration of loyalty to the emperor (which is how "Alexander" became a common Jewish name). The Samarians plot was rebuffed, and Kislev 21 was declared a holiday.
According to an alternative version (see Talmud Yoma 69a), this episode occurred on the 25th of Tevet.
The Satmar Rebbe, Rabbi Joel Teitelbaum (1887-1979), was rescued from the Bergen-Belsen concentration camp, along with 1,368 other Jews, through the efforts of Rudulf Kastner, head of the Zionist rescue operation in Hungary (an earlier transport of 1,686 Jews had been rescued on Av 29). The Satmar community celebrates the 21st of Kislev as a day of thanksgiving.
There’s nothing that matches the joy when a lost child returns home. And you are that child.
Because your soul began within G‑d.
And she descended into this world to inhabit a body and live as though a stranger to the heavens, captive of a futile dream, journeying upon many winding and perilous roads…
Until waking up one day and realizing that none of these lead back home.
And now, every day, with every prayer of your heart, with every word of Torah upon your lips, with every mitzvah and good deed you fulfill,
You are coming home.
There can be no greater joy—above and below.