Two years ago, I happened to attend a Shabbat gathering of bereaved families in Tel Aviv. Usually, in a full synagogue, there are something like five Levites, one woman who recently gave birth, perhaps a Bar Mitzvah, and four people reciting the Mourner’s Kaddish.   But when they reached the Kaddish there, the entire synagogue—hundreds of congregants—stood up and said, “Yitgadal v’yitkadash...