M. Chakraborti

“The first text book on the subject was Aristotle's Rhetoric which was written sometime between 322 and 320 B.C. In this book Aristotle defined rhetorical discourse "as the art of discovering all the available means of persuasion in any given case." During the Roman period great orators like Cicero and Quintilion also wrote some important books on the subject. They also agreed with Aristotle and defined rhetoric as the art of persuading an audience. At first it also included logic, that is, valid reasoning and the tricks or devices used in argument so as to produce intellectual and emotional effect on the audience in order to make them veer round the speaker's point of view. But today it means mostly the tricks.”
― M. Chakraborti, Principles of English Rhetoric and Prosody