 In the context of this assertion, Tsongkhapa offers a distinctive explanation of the well-known Nayāyika objection to Nāgārjuna's philosophy, namely, if the statements he uses to prove his thesis are themselves without any final intrinsic reality, they will be ineffective as proofs. Tsongkhapa says Prāsaṅgika-madhyamakas do not simply find faults in all positions and reject all positions as their own. They only deny any thesis that presupposes an intrinsic existence. They do hold a specific thesis, to wit, that all phenomena lack an intrinsic existence. They use reasoning and logic that lacks any essential reality to establish this thesis. Such reasoning derives its efficacity on a conventional level through the natural workings of dependent origination. This is one of the most contentious assertions of Tsongkhapa.