Today marks two things: It has been 1,000 days since the Oct. 7 terror attacks in southern Israel, a cataclysmic event in the history of Israel and the Jewish People, a dividing line between how things were and how they are. And it is the 17th day of the Hebrew month of Tammuz, a minor fast day, that kicks off a three-week period of gradual mourning until Tisha B’Av, when Jews remember the worst calamities that have befallen us. And on Saturday,…