During the horrific Battle of the Bulge at the end of World War II, my parents met in Paris, a city recently liberated from the dying Nazi army. During their first hours together, while walking along the Seine River, my mother opened her purse to show her new friend a prayer card that she always kept with her, written by the famous Belgian prelate, Cardinal Désiré Félicien François Joseph Mercier. O Holy Spirit, beloved of my soul, I adore You. Enlighten me, guide me, strengthen me, console me. Tell me what I should do; give me Your orders. My father...