Abstract

The paper disputes the common view which holds that to lie is, essentially, to assert a disbelieved proposition. It shows by reference to self-defeating prophecies that one can lie by asserting a believed proposition, and by reference to self-fulfilling prophecies that one can be truthful by asserting a disbelieved proposition. It concludes that lying is, essentially, asserting a proposition believed to be false conditionally on the occurrence of the assertion.