...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.
Marcus Aurelius, Plato, Aristotle (2012). “The Modern Library Collection of Greek and Roman Philosophy 3-Book Bundle: Meditations; Selected Dialogues of Plato; The Basic Works of Aristotle”, p.1731, Modern Library