  Assertibles (axiômata) differ from all other complete sayables in their having a truth-value: at any one time they are either true or false. Truth is temporal and assertibles may change their truth-value. The Stoic principle of bivalence is hence temporalized, too. Truth is introduced by example: the assertible ‘it is day’ is true when it is day, and at all other times false (D. L. 7.65). This suggests some kind of deflationist view of truth, as does the fact that the Stoics identify true assertibles with facts, but define false assertibles simply as the contradictories of true ones (S. E. M 8.85).