The massive quake that shook China's Sichuan province this week is one of the worst natural disasters – in terms of lives claimed and property destroyed – that the world has seen in some time. But an earthquake, according to Chinese tradition, is not a mere act of nature, nor is it simply a matter of fate. Traditionally, every earthquake announces profound changes that will affect the entire society. The Chinese still remember – as do I, having been in Beijing at the time – that the great Tangshan quake of 1976, which killed more than 240,000, came just before...