 one should hesitate in all things except those which are proved by living reason … These things, [the Academic] declares, are known; he passes doubtfully on other things, of which more certainty is to be had from experience. For the usual course of events makes probable what you always see under a similar pattern. Yet, since it sometimes happens otherwise, these things are not sufficiently certain, and yet not without evidence. What he, therefore, affirms to be true, he thinks to be necessary; for the rest, he says “I believe” or “I think it to be”. (EMM, ll. 1143–44, 1147–54)