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.
Animals do not gaze in wonder at the stars and angels are confined to the realm of the spirit, but the human being is G‑d’s bridge between heaven and earth.
Our bodies are formed from the dust; our souls are of the essence of G‑d. We alone can look at a physical world and see spiritual life and beauty. We who are beyond both heaven and earth, form and matter, spirit and body—we alone can fuse the two.