Entering a bustling shopping mall on the west side of Manhattan after a beautiful walk on the High Line, I was struck by the sight of a large, multicolored mural (by the artist Jamilla Okubo). It featured a woman looking into a mirror, but, instead of seeing her face, she saw the words: “When there is no enemy within, the enemy outside cannot hurt you.” I was surprised and fascinated to find, in the middle of a vast urban shopping mall, a message addressing the intimate life of the passerby as a psychological being rather than merely a consumer. For days afterward I thought about its message and about the ubiquity of such pop-psychological encouragements to think of oneself as a vessel carrying an “inner self”—a notion that still has a great deal of currency in mainstream psychological thought: the notion that this “inner self” is the principal source of our feelings, thoughts, and behaviors; the place where secret, internal enemies accumulate and thrive, threatening to harm us and daring us to conquer them.