Promises, Oaths, and Vows - On the Psychology of Promising

And on the other hand, what compels one to keep a promise (or vow or threat) when there seems to be no personal advantage in doing so, and even when harm can be predicted? How do we know when a promise is offered seriously to be taken at face value, and how do we understand that another is only a polite gesture, not to be taken seriously?

In Promises, Oaths, and Vows: On the Psychology of Promising, Herbert Schlesinger addresses these questions, drawing on the literature of moral development in children; the psychotherapy of a patient who regularly broke promises that were unnecessary in the first place; those who were regarded as "promising youngsters" who did not fulfill their "promise"; and those who feared making a promise, a commitment, or a threat out of fear that, once made, the utterance would take on a life of its own and could never be taken back. Furthermore, he illustrates his conclusions by examining the widespread use of promising in classical literature, such as Greek drama and the plays of Shakespeare, as well as the motivating and reifying power of the promise in Western religious traditions.