The subject of autobiography is always self-definition, but it cannot be self-definition in the void. The memoirist, like the poet and the novelist, must engage with the world, because engagement makes experience, experience makes wisdom, and finally it’s the wisdom—or rather the movement toward it—that counts. “Good writing has two characteristics,” a gifted teacher of writing once said. “It’s alive on the page and the reader is persuaded that the writer is on a voyage of discovery.