7 Josephus uses a technical rhetorical term ( τεκμήριον). Cf. §§ 55, 344, 358. Aristotle establishes the use of this term for a necessary proof ( Rhet. 1.2.16) and Quintilian, though writing Latin, quotes the word in Greek ( Inst. 5.9.3) to characterize a compelling proof ( signum necessarium): one from which there is no getting away, as distinct from an artful argument. Josephus is out to make an irrefutable—in rhetorical terms—case for his ancestry and character.