By "common heritage" we mean the underlying unity of the Eastern and Western wings of the Christian civilization—long split by the tragedy of the Great Schism, and now threatened by the rot of disbelief, Christophobic norms and functional nihilism rampant throughout the Western world, but still one. This beautiful part of the world is an especially apt spot from which to contemplate such unity. Here in Northern California the expansion of the West, the Latin Church—embodied in the conquistadors and missionaries from Spain—achieved its maximum geographic outreach some 250 years ago near San Francisco. Not long thereafter, the eastward expansion...