But though Sophistic grew mainly out of Rhetoric, it had its roots also in Philosophy. It was sometimes defined as Rhetoric philosophizing.[156] It threw off altogether the fiction of a law-court or an assembly, and discussed in continuous speech the larger themes of morality or theology. Its utterances were not “exercises” but “discourses” (διαλέξεις).[157] It preached sermons. It created not only a new literature, but also a new profession. The class of men against whom Plato had inveighed had become merged in the general class of educators: they were specialized partly as grammarians, partly as rhetoricians: the word “sophist,” to which the invectives had failed to attach a permanent stigma, remained partly as a generic name, and partly as a special name for the new class of public talkers. They differed from philosophers in that they did not mark themselves off from the rest of the world, and profess their devotion to a higher standard of living, by wearing a special dress.[158] They were a notable feature of their time. Some of them had a fixed residence and gave discourses regularly, like the “stated minister” of a modern congregation: some of them travelled from place to place. The audience was usually gathered by invitation. There were no newspaper advertisements in those days, and no bells; consequently the invitations were personal. They were made sometimes by a “card” or “programme,” sometimes by word of mouth: “Come and hear me lecture to-day.”[159] Sometimes a messenger was sent round; sometimes the sophist would go round himself and knock at people’s doors and promise them a fine discourse.[160]