In Galatians Paul is defending the Truth of the Gospel (Galatians 2:5.14) and fighting against the work of rival missionaries who were perverting the Christian message in those communities. Paul was aware that many of his arguments and propositions could lead to false conclusions. To avoid doubts and persuade his readers about the Truth, one of the resources that Paul uses is to ask questions and answer them in order to anticipate the false conclusions that his readers might draw from his propositions. These questions of the hypothetical interlocutor, generally considered absurd, are answered with a vehement by no means! (un yevoito). In this work we seek to investigate the use of this expression in Galatians by comparing it with its use in Greek literature (biblical and extrabiblical) in order to achieve greater clarity of the meaning of the expression in Galatians. Scholars have sought an answer to Paul s use of un yevoito in Epictetus (50- 135 AD), however, the thesis of this research is that the answer can be found in the greek orators before Paul. We believe that this topic is relevant since there is almost no specific bibliography regarding the use of the expression un yevoito, and the one that exists is restricted to its use in the diatribe.