" Thesis . This advanced exercise [one of the progymnasmata ] asks the student to write an answer to a 'general question' ( quaestio infina )--that is, a question not involving individuals. . Quintilian . . notes that a general question can be made into a persuasive subject if names are added (). That is, a Thesis would would pose a general question such as 'Should a man marry?' or 'Should one fortify a city?' (A Special Question on the other hand would be 'Should Marcus marry Livia?' or 'Should Athens spend money to build a defensive wall?')"
(James J. Murphy, A Short History of Writing Instruction: From Ancient Greece to Modern America , 2nd ed. Lawrence Erlbaum, 2001)