I came across this article by Zadie Smith via John Naughton.
Zadie Smith on Joan Didion
Magical thinking is a disorder of thought. It sees causality where there is none, confuses private emotion with general reality, imposes—as Didion has it, perfectly, in “The White Album”—“a narrative line upon disparate images.” But the extremity of mourning aside, it was not a condition from which she generally suffered. Didion’s watchword was watchword. She was exceptionally alert to the words or phrases we use to express our core aims or beliefs. Alert in the sense of suspicious. Radically upgrading Hemingway’s “bullshit detector,” she probed the public discourse, the better to determine how much truth was in it and how much delusion. She did that with her own sentences, too. [emphasis added]