When a man seeking the reputation of eloquence stands before a human judge, while a thronging multitude surrounds him, and inveighs against his enemy with the most fierce hatred, he takes most vigilant heed that his tongue does not slip in a grammatical error, for example, and say inter hominibus [instead of inter homines], but he takes no heed lest, in the fury of his spirit, he cut off a man from his fellow men [ex hominibus].
Book 1, Chapter 18, translated by A. Outler (Dover: 2002)