Nagarjuna stands at the heart of Mahayana thought because he gave a precise philosophical voice to what emptiness actually means. Drawing on earlier teachings of non-self and impermanence, he argued that all phenomena are empty of inherent existence, lacking any independent, self-sufficient reality. This was not presented as a new metaphysical substance, but as a way of saying that things exist only in dependence on causes, conditions, and conceptual designation. By identifying emptiness with dependent origination, he showed that because things arise dependently they lack fixed essence, and precisely because they are empty they can arise and function dependently. This deepened the understanding of core Buddhist doctrines such as non-self, the Four Noble Truths, and karma without appealing to any permanent underlying substance.

From this insight into emptiness, Nagarjuna articulated the famous doctrine of the two truths: conventional and ultimate. On the level of conventional truth, the world of persons, objects, and causal relations operates in a way that is reliable enough for communication, ethical responsibility, and practice. On the level of ultimate truth, analysis reveals that all such things are empty of inherent nature. This framework allowed Buddhist thinkers to reconcile everyday experience with the radical insight of emptiness, without collapsing into either dogmatic realism or nihilism. In this sense, his “Middle Way” avoids the extremes of asserting that things truly and permanently exist, on the one hand, or that nothing exists at all, on the other.

Nagarjuna’s method was as influential as his conclusions. He employed prasaṅga, or reductio ad absurdum, to show that reified views of causality, substance, time, or even nirvana lead to contradiction and confusion. This dialectical style became a model for later Buddhist debate and logical analysis, especially within the Madhyamaka tradition. By exposing the limits of conceptual thought, his arguments did not merely serve intellectual purposes; they also undermined subtle forms of clinging to views, thereby supporting the path of non-attachment and liberation. The deconstruction of fixed concepts thus functioned as both philosophy and spiritual therapy.

Historically, his writings became foundational for the Madhyamaka school and for Mahayana Buddhism more broadly. Later Indian, Tibetan, and East Asian traditions treated his works as central sources for understanding emptiness and the Middle Way, and his ideas permeated diverse schools and practices. His synthesis of emptiness, dependent origination, and the two truths provided a philosophical grounding for key Mahayana scriptures and for the bodhisattva path, where wisdom and compassion are seen as inseparable. For many later Buddhists, this combination of rigorous reasoning and soteriological depth elevated Nagarjuna to the status of a second great architect of the Dharma.