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 yahrtzeit (anniversary of the passing) of the Lubavitcher Rebbe's father, Rabbi Levi Yitzchak Schneerson (1878-1944), in Alma Ata, Kazakhstan. Rabbi Levi Yitzchak was Chief Rabbi of Yekaterinoslav (currently Dnepropetrovsk), 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.
True peace is not a forced truce, not a homogenization of differences, not a common ground that abandons our home territories.
True peace is the oneness that sprouts from diversity, the beauty that emerges from a panorama of colors, strokes and textures, from the harmony of many instruments each playing a unique part, not one overlapping the other’s domain by even the breadth of a hair.
Those who attempt to blur those borders, whatever be their motives—they are unwittingly destroying the world.
Beginning with the crucial border between man and woman. For this is the beginning of all diversity, the place where G‑d’s oneness shines most intensely from within His precious world.