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Jay L. Garfield describes that Nāgārjuna approached causality from the four noble truths and dependent origination. Nāgārjuna distinguished two dependent origination views in a causal process, that which causes effects and that which causes conditions. This is predicated in the two truth doctrine, as conventional truth and ultimate truth held together, in which both are empty in existence. The distinction between effects and conditions is controversial. In Nāgārjuna's approach, cause means an event or state that has power to bring an effect. Conditions, refer to proliferating causes that bring a further event, state or process; without a metaphysical commitment to an occult connection between explaining and explanans. He argues nonexistent causes and various existing conditions. The argument draws from unreal causal power. Things conventional exist and are ultimately nonexistent to rest in the middle way in both causal existence and nonexistence as casual emptiness within the Mūlamadhyamakakārikā doctrine. Although seeming strange to Westerners, this is seen as an attack on a reified view of causality.