Sextus Empiricus Pyrrhoniae Hypotyposes 2.8.84

[84] But awe,—having regard here again to the plan of our treatise,—shall confine our present discussion to the true, since its refutation entails that of truth as well, it being defined as the ‟system of the knowledge of things true.” Again, since some of our arguments, whereby we dispute the very existence of the true, are more general, others of a specific kind, whereby we prove that the true does not exist in utterance or in expression or in the movement of the intellect, we deem it sufficient for the present to set forth only those of the more general kind. For just as, when the foundation of a wall collapses, all the super- structure collapses along with it, so also, when, the substantial existence of the true is refuted, all the particular inventions of the logic of the Dogmatists are included in the refutation.