“Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.”

“Vladimir: I don't understand. Estragon: Use your intelligence, can't you? Vladimir uses his intelligence. Vladimir: (finally) I remain in the dark.”

“..The argument he was conducting with his neighbor as to whether the English magician had gone mad because he was a magician, or because he was English.”

“I'm merely trying to give you the sort of argument that would appeal to your intelligence.”

“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.”

“He only employs his passion who can make no use of his reason.”