But there is a difference: in Rhetoric, one who acts in accordance with sound argument, and one who acts in accordance with moral purpose,are both called rhetoricians; but in Dialectic it is the moral purpose that makes the sophist, the dialectician being one whose arguments rest, not on moral purpose but on the faculty.
Some animals utter a loud cry. Some are silent, and others have a voice, which in some cases may be expressed by a word; in others, it cannot. There are also noisy animals and silent animals, musical and unmusical kinds, but they are mostly noisy about the breeding season.
Again, those also who are ignorant of legal regulations which they are bound to know, and which are not hard to know, they chastise; and similarly in all other cases where neglect is thought to be the cause of the ignorance, under the notion that it was in their power to prevent their ignorance, because they might have paid attention.