Quintilian, and J.S. Watson. Institutes of Oratory.Edited by Lee Honeycutt, 2010. Kindle Electronic Edition. Book V Chapter 2.
Quintilian here takes us to consider previous case law. He divides those cases into three groups (Quintilian V.2.1): similar cases already decided, directly related cases, and cases in which sentences have been passed. To consider this body of case law, Quintilian urges evaluating the authority of the judges and the level of similarity (Quintilian V.2.2). The person pleading the case often needs to make the similarities very plain (Quintilian V.2.3).