 Like Aristotle, Boethius often treated statement-making utterances as temporally indeterminate sentences. The same sentence can be uttered at different times, and many of these temporally indeterminate sentences may sometimes be true and sometimes false, depending on the circumstances at the moment of utterance. If the state of affairs the actuality of which makes the sentence true is omnitemporally actual, the sentence is true whenever it is uttered. In this case, it is necessarily true. If the state of affairs associated with an assertoric sentence is always non-actual, the sentence is always false and therefore impossible. A sentence is possible only if what is asserted is not always non-actual (I, 124–125). Quasi-statistical ideas are also employed in Ammonius’s Greek commentary on Aristotle’s De interpretatione which shares some sources with Boethius’s work (88.12–28) and in Alexander of Aphrodisias’s commentary on Aristotle’s modal syllogistic. (See Mueller 1999, 23–31.)