It was the act of imagining herself as she had once been that enriched her syntax and extended not only her images but the coherent flow of association that led directly into the task at hand.

The better the speaker imagined herself, the more vividly she brought the dead doctor to life. It was, after all, a baptism by fire that was being described. To see her ambitious young self burning to know what her mentor knew, we had to see the mentor as well: an agent of threat and promise: a figure of equal complexity.

To fashion a persona out of one’s own undisguised self is no easy thing. A novel or a poem provides invented characters or speaking voices that act as surrogates for the writer. Into those surrogates will be poured all that the writer cannot address directly—inappropriate longings, defensive embarrassments, anti-social desires—but must address to achieve felt reality. The persona in a nonfiction narrative is an unsurrogated one. Here the writer must identify openly with those very same defenses and embarrassments that the novelist or the poet is once removed from.

Didion’s “essay” into herself tells us a thing we all know to be true: that the power of everyday anxiety is ruthless: it makes us act against our own well-being, sometimes it even makes us court perversity, a thing we are ashamed of, can hardly bear to look at.

When Rousseau observes, “I have nothing but myself to write about, and this self that I have, I hardly know of what it consists,” he is saying to the reader, “I will go in search of it in your presence. I will set down on the page a tale of experience just as I think it occurred, and together we’ll see what it exemplifies, both of us discovering as I write this self I am in search of.” And that was the beginning of memoir as we know it.

The writing continues to dazzle while the structure falls apart. And rightly so. Because, after all, what difference does it really make—the second and third times around—which comes first? We are in the presence of a man in a trance of self-analysis: a man who will never act on what he knows and therefore is compelled to go on “knowing.