First printing of the Zohar, the fundamental work of the Kabbalah (Jewish esoteric and mystical teachings), authored by the Talmudic sage, Rabbi Shimon Bar Yochai.
Links: The Kabbalah
Av 20 is the anniversary of the passing of the Lubavitcher Rebbe's father, Rabbi Levi Yitzchak Schneerson (1878-1944), in Alma Ata (currently Almaty), Kazakhstan. Rabbi Levi Yitzchak was Chief Rabbi of Yekaterinoslav (currently Dnipro), Ukraine, and was arrested and exiled to Kazakhstan by the Stalinist regime as a result of his work to preserve Jewish life in the Soviet Union.
Links:
A Brief Biography
Rebbetzin Chana Scneerson's biography, which includes her account of her husband's heroism, arrest and passing.
Just who are the oppressors of which you are victim? People? Institutions? The Laws of Nature? They are but tools in the hand of their Master. Or are you the victim of your own Creator?
The Designer of this cosmos does not contrive schemes to undermine His own creations. He knows us as He knows Himself; He sees His world from our eyes; He is our life and our essence. When He makes demands of us, He meets us on our own ground, not according to His unlimited power, but finely measured to the capacity He has hidden within us.
There are times when you compare the burden on your shoulders to the strengths you know you have, and it seems impossible. But He knows better the hidden powers of your soul. And He has faith in them. For He is there within them.