 Cicero responds by sketching a distinction, made by the sceptical philosopher Clitomachus, of two ways in which one might withhold assent: by refraining (a) from ‘completely’ assenting to anything, and (b) from approving or disapproving. The wise sceptic will never completely assent to any impression but will ‘approve’ those that are plausible and ‘disapprove’ those that are not. One will then be able to act on the basis of those impressions one approves, without having entirely assented to them (2.104).