Professor Vlastos argues that Socratic irony was responsible for a momentous change in the way in which irony was understood in ancient times. Before Socrates, he argues, irony is connected with lying and deceit, but after Socrates it is associated with wit and urbanity. Vlastos claims that Socratic irony is distinctive and complex. According to Vlastos, Socratic irony involves no hint of deception; it consists simply in saying something which when understood in one way is false, but when understood in another way is true.