Rudolf Bultmann's dissertation is still the best general description of diatribal style and remains the authority on the subject for most NT scholars. Bultmann draws attention to the dialogical element in the diatribe in which a speaker or writer makes use of an imaginary interlocutor who asks questions or raises objections to the arguments or affirmations that are made. These responses are frequently stupid and are then summarily rejected by the speaker or writer in a number of ways, for example by οὐδαμῶς (“by no means”), οὐ πάντως (“not at all”), οὐ μὰ Δία (“indeed not”), or minime (“by no means”). The limited purpose of this paper is to examine the way in which μὴ γένοιτο (“by no means”) is widely used in the diatribal literature, usually thought to be represented in Greek by the Dissertation of Epictetus, certain Moralia of Plutarch, various works of Philo, and by Bion, Teles, Musonius, Dio Chrysostom, Lucian, and Maximus of Tyre. In fact, however, this particular rejection, as it appears as a response in a dialogue without being part of a larger sentence, is unique to Epictetus and Paul. Bultmann's interpretation of the diatribe is heavily dependent on Epictetus despite the latter's peculiar development of the style, and the generalization about the use ofμὴ γένοιτο in the diatribe is made on the basis of Epictetus.