Right there is the usefulness of migraine, there in that imposed yoga, the concentration on the pain. For when the pain recedes, ten or twelve hours later, everything goes with it, all the hidden resentments, all the vain anxieties. The migraine has acted as a circuit breaker, and the fuses have emerged intact. There is a pleasant convalescent euphoria.

We Tell Ourselves Stories in Order to Live: Collected Nonfiction (ed. Everyman's Library, 2006)