The exigence is defined as the reason that prompted you to write about your topic, the motivation that makes you write about the topic. Exigence and purpose are like two-sides on the same coin, sharing similarities but are two distinct concepts. Purpose is the specific change that the author of a writing seeks to achieve and the response to exigence while exigence is the circumstances that inspired someone to persuade and the start of rhetorical discourse about a particular issue.