 This feature reflects, in turn, Cicero’s allegiance to Academic scepticism. Now the extent and nature of this allegiance is a matter of debate (see Glucker 1988, Görler 1995, Thorsrud 2012, Brittain 2016, Wynne 2018) but what matters for present purposes is that the sceptical stance takes it as a mistake to believe that certainty is possible. The most one can do is form a judgement that some particular position is more or less plausible than another, such a judgement itself being revisable in the light of further evidence or argument.