“No concrete test of what is really true has ever been agreed upon,” wrote William James in 1893. “When, indeed, one remembers that the most striking practical application to life of the doctrine of objective certitude has been the conscientious labors of the Holy Office of the Inquisition, one feels less tempted than ever to lend the doctrine a respectful ear.”

John Florio’s 1603 translation of Michel de Montaigne’s essays contains an early instance of the word emotion being used to refer to feelings distinct from reasoning. Unsure of the word’s merits, Florio included it on a list of “uncouth termes” he apologized to readers for introducing into English from the French.

At a hospital in Milledgeville, Georgia, in 1952, a Dr. Hatcher tried to convince a Dr. Cranford to watch him perform a transorbital lobotomy. “Nothing to it,” Hatcher said. “I take a sort of medical ice pick, hold it like this, bop it through the bones just above the eyeball, push it up into the brain, swiggle it around, cut the brain fibers like this, and that’s it.” Cranford responded, “I was going to breakfast, but I’ve changed my mind.” Hatcher laughed. “You can change your mind,” he said, “but not like I can change it.”

The Communist Party of China considered “revolution in mind” a prerequisite for political emancipation in the 1940s. Work reports tell of “speaking bitterness” sessions—in which peasants would share stories of their oppression—sometimes referred to as “turn-over-mind meetings.” The meetups later served as inspiration for feminist consciousness-raising groups in the United States during the 1970s.