 Moreover, the notion of plausibility is, logically, tied to the notion of truth: what is plausible is what ‘resembles truth’, in Latin veri simile, the phrase Cicero uses as an alternative for probabile to represent the concept of plausibility. If something is plausible, then it is likely (though not certain) to be true. But the sceptics by their own admission have no criterion for determining what is true. Hence, they have no way of judging something as likely to be true, since that presupposes a standard of truth against which the purported plausibility would be judged.