Rhetoric may be defined as the faculty of observing in any given case the available means of persuasion.
AristotleWe are better able to study our neighbours than ourselves, and their actions than our own.
Aristotle...we are all inclined to ... direct our inquiry not by the matter itself, but by the views of our opponents; and, even when interrogating oneself, one pushes the inquiry only to the point at which one can no longer offer any opposition. Hence a good inquirer will be one who is ready in bringing forward the objections proper to the genus, and that he will be when he has gained an understanding of the differences.
Aristotle