Indian Philosophy » Saṃsāra & Nirvāṇa » Nirvāṇa » The ontological tetralemma does not apply to nirvāṇa » Nirvāṇa is neither an entity nor a non-entity » Nirvāṇa is not both entity and non-entity » Reductio ad absurdum: if it was both » Liberation would be both too » It is because neither existence nor non-existence is established in liberation