Yet Jews, Christians, and Muslims still strove to improve their relationships, despite—or, perhaps, because of—their seemingly unrelenting enmities. The Holocaust’s enormity triggered a crisis of conscience among churches contemplating Christianity’s complicity in genocide. The most fateful reaction was the Second Vatican Council’s promulgation in 1965 of Nostra Aetate (“In Our Time”), which asserted that “God holds the Jews most dear” and decried all “displays of anti-Semitism.” It further allowed that other religions, including Islam, reflect a ray of truth, urging mutual conversation and cooperation, although it also presumed that the Church had little, if anything, to learn from other faiths. Pope Benedict XVI’s invocation of a Byzantine emperor who accused Muhammad of condoning violence to spread Islam prompted an open letter originally endorsed by 138 prominent Muslims: “A Common Word Between Us and You” (2007). Taking its title from Quran 3:64, which solicits the “People of the Book” to acknowledge that they all worship God, this reply invited a range of Christian church leaders, not just Catholics, “to come together with us,” averring that the world’s future depends on its two largest religious communities fostering peace and justice. The most prominent Jewish response to Nostra Aetate was “Dabru Emet” (“Speak Truth”), a statement authored privately by four university scholars, signed by more than 200 rabbis and intellectuals, and published in two American newspapers. Acknowledging the recent “unprecedented shift in Jewish and Christian relations,” it affirmed that Jews and Christians worship the same God, that they accept the Torah’s moral principles, and, most controversially among Jews, that “Nazism was not a Christian phenomenon.”