Full Idea
[The sceptical Academics say] what is false cannot be perceived, but every true presentation is such that there can be a false presentation of the same quality.
Gist of Idea
Every true presentation can have a false one of the same quality
Source
M. Tullius Cicero (Academica [c.45 BCE], II.40)
Book Reference
'The Stoics Reader', ed/tr. Inwood,B/Gerson,L.P. [Hackett 2008], p.41
A Reaction
It was the stoics who focused the discussion on 'presentations'. This claim is purely theoretical; no one has ever experienced a false presentation of talking to a family member that was as vivid as the real thing.