   Roughly speaking, Frede is proposing that the difference between the kinds of belief a Skeptic can have and the ones the Skeptic cannot have is a difference in the way the beliefs are formed. If the belief that p has been formed ‘on reasoned grounds’—‘as a result of marshalling arguments or considerations in favour of p’ (Morison 2011: 266), or perhaps as a result of simply thinking that there are such grounds without having yet marshalled them—then this belief counts as a belief of the sort the Skeptic cannot have, and if the belief that p has been formed not on the basis of the marshalling of arguments, but just because that is how things strike the person who forms the belief, then this belief counts as a belief of the sort the Skeptic can have. (See Perin 2010a and b for doubts about whether this interpretation can be extracted from Sextus’ text.) [See the supplementary document Interpreting Frede.] 