Chaim Perelman
Chaïm Perelman was a Polish-born philosopher of law, who studied, taught, and lived most of his life in Brussels. He was among the most important argumentation theorists of the twentieth century. His chief work is the Traité de l'argumentation – la nouvelle rhétorique (1958), with Lucie Olbrechts-Tyteca, translated into English as The New Rhetoric: A Treatise on Argumentation, by John Wilkinson and Purcell Weaver (1969).
“One can indeed try to obtain a particular result either by the use of violence or by speech aimed at securing the adherence of minds. It is in terms of this alternative that the opposition between spiritual freedom and constraint is most clearly seen. The use of argumentation implies that one has renounced resorting to force alone, that value is attached to gaining the adherence of one's interlocutor by means of reasoned persuasion, and that one is not regarding him as an object, but appealing to his free judgment. Recourse to argumentation assumes the establishment of a community of minds, which, while it lasts, excludes the use of violence.”
Chaim Perelman