 The Sautrāntika’s theory of ultimate truth mirrors its ontology of flux in which unique particulars are viewed as spatially infinitesimal atoms constituting temporally momentary events (kṣaṇika) or as successive flashes of consciousnesses, cognitive events, all devoid of any real continuity as substratum. Unique particulars are ultimately real, although they are not enduring substances (dravyas) inhering in it’s qualities (guṇas) and actions (karmas) as the Naiyāyika-Vaiśeṣika claims. They are rather bundles of events arising and disappearing instantly. Even continuity of things and motion are only successive events closely resembling each other. On this theory ultimate realities are momentary point instants, and Vasubandhu and Dharmakīrti both argue that no conditioned phenomenon, therefore, no ultimately real unique particulars, endure more than a single moment—hence they are momentary instants (kṣaṇika).