“Positive thinking did not abolish the need for constant vigilance; it only turned that vigilance inward. Instead of worrying that one’s roof might collapse or one’s job be terminated, positive thinking encourages us to worry about the negative expectations themselves and subject them to continual revision. It ends up imposing a mental discipline as exacting as that of the Calvinism it replaced—the endless work of self-examination and self-control or, in the case of positive thinking, self-hypnosis. It requires, as historian Donald Meyer puts it, “constant repetition of its spirit lifters, constant alertness against impossibility perspectives, constant monitoring of rebellions of body and mind against control. This is a burden that we can finally, in good conscience, put down.”