On the 10th of Tevet of the year 3336 from Creation (425 BCE), the armies of the Babylonian emperor Nebuchadnezzar laid siege to Jerusalem. Thirty months later -- on Tammuz 17, 3338 -- the city walls were breached, and on 9 Av of that year, the Holy Temple was destroyed. The Jewish people were exiled to Babylonia for 70 years.
Link: Asarah B'Tevet
Tevet 10 is observed as a day of fasting, mourning and repentance, in remembrance of the siege of Jerusalem. We refrain from food and drink from dawn to nightfall, and add the Selichot and other special supplements to our prayers. (More recently, Tevet 10 was chosen to also serve as a "general kaddish day" for the victims of the Holocaust, many of whose day of martyrdom is unknown.)
Links:
Learn about Tevet 10
Essays and Stories on the Holocaust
When the Mighty Waters cover your head, suffocating the soul and the flame that burnt inside . . .
When raging torrents of confusion drag you away in their current, ripping you from your hold on Life . . .
Look deeper. Beyond the soul.
For the soul itself, as well as the flame it holds, are rooted in a serene G‑dly World of Emanation, a world of quietness and sublime harmony.
But the turbulence of this world is rooted even beyond that, stemming from a World of Confusion, of light unbounded and untamed, before the orderly emanation of defined being, “and the world was confused and void, with darkness over the face of the deep.”
So you must dig deeper than those roots, to find the coals from which the flame arose and the flint rock from which the spark was struck. Deeper, until you reach the primordial essence of the soul, beyond Emanation, beyond Light—even beyond the unbounded light of pre-creation. Where there is nothing but the seminal thought which inspired all that is and was and will come to be.
And what was that thought? It was the thought of you here and now, in your struggle with this world, and the delicious taste of your victory.
And, since in that thought there is no past and future, there, in that thought, you have already won.
Now you must make it happen.