What do I mean by “calling”? For the moment let me say simply that calling is the truth that God calls us to himself so decisively that everything we are, everything we do, and everything we have is invested with a special devotion and dynamism lived out as a response to his summons and service. This truth—calling—has been a driving force in many of the greatest “leaps forward” in world history—the constitution of the Jewish nation at Mount Sinai, the birth of the Christian movement in Galilee, and