 In his monograph Essence of Eloquence, Tsongkhapa employs a hermeneutics that treats language and knowledge as equally semiotic in nature. This is consistent with Tsongkhapa's view that any intellectual act is itself utterly devoid of any essential reality, yet functions on a conventional level through the natural workings of dependent origination (Sk. dharmatā). This view allows him to conclude that Dignāga and Dharmakīrti's Logico-epistemological school is equivalent to Asaṅga's Yogācāra school insofar as the former school asserts a specific mark, seen by direct sense perception, that is necessary in order to retain the reality of the conventional world. Tsongkhapa takes the strong position that no datum that appears to (or is there but unknown to) thought or sense perception, has any essential reality. All are, equally, simply labeled by thought construction (Tib. rtog pas btags tsam). Only convention makes the actual sense-faculties, for example, real, and success or failure experienced in a dream, for example, false. This dependent origination (between a label and what is labeled) precludes the essential existence implicit in the Epistemologist's sva-lakṣaṇa.