Kitap 2
25.8
Now the material of enthymemes is derived from four sources—probabilities, examples, necessary signs, and signs. Conclusions are drawn from probabilities, when based upon things which most commonly occur or seem to occur; from examples, when they are the result of induction from one or more similar cases, and when one assumes the general and then concludes the particular by an example; from necessary signs, when based upon that which is necessary and everTranslating ἀεί inserted by Vahlen before ὄντος. exists; from signs, when their material is the general or the particular, whether true or not. Now, the probable being not what occurs invariably but only for the most part, it is evident that enthymemes of this character can always be refuted by bringing an objection.
25.9
But the objection is often only apparent, not real; for he who brings the objection endeavors to show, not that the argument is not probable, but that it is not necessary.
