Nirvana truly realized is Samsara properly understood (from Buddha and the Path to Enlightenment, by Raghavan Iyer, Theosophy Library Online, Internet 1986)
The Madhyamika school traces its origin to Nagarjuna, the brilliant philosopher and formidable dialectician who flourished in the late second century A.D. Taking Buddha’s advocacy of the Middle Way between harmful extremes, between avid indulgence and austere asceticism, and between sterile intellectualization and suffocating mental torpor, Nagarjuna developed a rigorous dialectical logic by which he reduced every philosophical standpoint to an explosive set of contradictions. This did not lead to the closure of scepticism, as the less vigorously pursued pre-Socratic philosophies did, but rather to the elusive standpoint that neither existence nor non-existence can be asserted of the world and of everything in it. The Madhyamikas, therefore, refused to affirm or deny any philosophical proposition. Nagarjuna sought to liberate the mind from its tendencies to cling to tidy or clever formulations of truth, because any truth short of shunyata, the voidness of reality, is inherently misleading. Relative truths are not like pieces of a puzzle, each of which incrementally adds to the complete design. They are plausible distortions of the truth and can seriously mislead the aspirant. They cannot be lightly or wholly repudiated, however, for they are all the seeker has, and so he must learn to use them as aids whilst remembering that they are neither accurate nor complete in themselves.
By the fifth century two views of Nagarjuna’s work had emerged. The followers of Bhavaviveka thought that Madhyamika philosophy had a positive content, whilst those who subscribed to Buddhapalita’s more severe interpretation said that every standpoint, including their own, could be reduced to absurdity, which fact alone, far more than any positively asserted doctrine, could lead to intuitive insight (Prajña) and Enlightenment. Chandrakirti’s remarkable defence of this latter standpoint deeply influenced Tibetan Buddhist traditions as well as those schools of thought that eventually culminated in Japan in Zen. Nagarjuna’s dialectic revealed the shunya or emptiness of all discursive, worldly thought and its proliferating categories.
For the Madhyamikas, whatever can be conceptualized is therefore relative, and whatever is relative is shunya, empty. Since absolute inconceivable truth is also shunya, shunyata or the void is shared by both Samsara and Nirvana. Ultimately, Nirvana truly realized is Samsara properly understood. The fully realized Bodhisattva, the enlightened Buddha who renounces the Dharmakaya vesture to remain at the service of suffering beings, recognizes this radical transcendental equivalence. The Arhant and the Pratyeka Buddha, who look to their own redemption and realization, are elevated beyond any conventional description, but nonetheless do not fully realize or freely embody this highest truth. Thus for the Madhyamikas, the Bodhisattva ideal is the supreme wisdom, showing the unqualified unity of unfettered metaphysics and transcendent ethics, theoria and praxis, at the highest conceivable level.