  If Pyrrhonian Skeptics are still investigating any matter you like, there is no distinctive set of beliefs which mark them out as a school. Amongst the things Platonists believe is the proposition that the only truly real things are Forms (and their discovery of this is what their investigation into the question ‘what is there?’ culminated in), and amongst the things Aristotelians believe is the proposition that the soul is the actuality of the living body as such (and their discovery of this is what their investigation into the question ‘what is the soul?’ culminated in). Holding these beliefs is partially constitutive of what it is to be an Aristotelian or a Platonist. Skeptics have not yet found answers to those questions, because they are still investigating them. It follows that to be a Skeptic is not to subscribe to a set of beliefs in the way that members of the other Philosophical Schools do. Yet there must be something about them that makes them count as Skeptics. What, then, is Skepticism? Sextus’ answer is that it is an ability or skill (I 8), not a set of beliefs. 