In "Rhetoric", Aristotle identifies three artistic modes of persuasion, one of which is "awakening emotion (pathos) in the audience so as to induce them to make the judgment desired." In the first chapter, he includes the way in which "men change their opinion in regard to their judgment. As such, emotions have specific causes and effects" (Book 2.1.2–3). Aristotle identifies pathos as one of the three essential modes of proof by his statement that "to understand the emotions—that is, to name them and describe them, to know their causes and the way in which they are excited (1356a24–1356a25). Aristotle posits that, alongside pathos, the speaker must also deploy good ethos in order to establish credibility (Book 2.1.5–9).