Chad Bird on Instagram: "“All happy families are alike; each unhappy family is unhappy in its own way.” So begins Leo Tolstoy’s classic novel, Anna Karenina. But I disagree. Unhappy families are ordinarily unhappy in predictable ways because sin—which usually leads to unhappiness—is boringly uncreative. Same old rebellions, same old infidelities, same old resentments that have plagued marriages and embittered children from the dawn of time. There are exceptions, of course, such as when...