One more general word of introduction. All language about the future, as any economist or politician will tell you, is simply a set of signposts pointing into a fog. We see through a glass darkly, says St. Paul as he peers toward what lies ahead. All our language about future states of the world and of ourselves consists of complex pictures that may or may not correspond very well to the ultimate reality. But that doesn’t mean it’s anybody’s guess or that every opinion is as good as every other one. And—supposing someone came forward out of the fog to meet us? That, of course, is the central
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