Heraclitus taught that change is life's only constant—yet many leaders refuse to change when disaster looms. But not all. From Rabbi Yochanan ben Zakkai, to William of Orange, to Moses in Parshat Devarim, history's great leaders understood when to "recalculate" their approach. As we read Devarim and approach Tisha B'Av, Rabbi Dunner explores how embracing necessary change, rather than clinging to failed strategies, offers the best path forward.