The fifth of Av marks the passing of Rabbi Yitzchak Luria, known as the Arizal, who was a foremost scholar of Jewish mysticism and the father of his own school of Kabbalah.
He left few writings – his teachings were only compiled by his students after his passing, yet his every custom was studied and adopted by his disciples even during his lifetime.
Over the course of time, these customs became authoritative in many communities. In an address to children the Rebbe explains that one need not be a mystic to implement them.
4 Av, 5740 – July 17, 1980
From Living Torah Volume 130 Program 517