Any student of my teaching, said the Buddha, ‘who is eager, intelligent and aware, here and now, can master nirvana (nibbanam) for the self (attano). — Sutta-Nipata
In life,the highest aim (paramartha) of Buddhism is said to be nirvana which is undying (amrita) according to the Buddha. This means there is something within us that can reach this undying nirvanic state. Alternatively, nirvana is, for us, in our very self (pratyatman) according to the Buddha. It is not something outside of us that we have to move towards in a physical way.
Along with nirvana, the self is the ne plus ultra when by the Buddha’s path it purifies itself of the Five Aggregates that serve to make up the image of the temporal world and the bodily being (satkaya). Both nirvana and the self are coordinate and come together in perfect unity. What is realized is that nirvana is the self that sees itself free of bodily dependence so that with this freedom, it also sees itself as being free of all conditioned things which is also the Tathagata.
Kâshyapa, accordingly at the time one becomes a Tathagata, a Buddha, he is in nirvana, and is referred to as “permanent” “steadfast”, “calm”, “eternal” and “atman” (Mahabheriharaka Sutra).
It also needs to be briefly discussed, that knowing and seeing oneself as being free of the body, that is, being independent, carries with it the realization of the fundamental nature of reality, itself, this being Dharma.
“The Dharma obtained by me is profound, of deep splendor, difficult to see, difficult to understand, incomprehensible, having the incomprehensible as its scope, fine, subtle, the sense of which can only be understood by the wise” (Catusparisat Sûtra).
Dharma can be thought of as a subtle cosmological governing force that is transcendent which, incidentally, is often translated as “law”. In this respect, sensuous, worldly matters, insofar as they are conditioned, run counter to Dharma (the unconditioned). The difference becomes thus a transgression leading to suffering. Moreover, the idea of transgression suggests continual judgment (karma) that compels the transgressor to overcome the judgment by many diverse means—many of which are unsuccessful.
On the other hand, as the transgressor approximates Dharma there is less suffering. The transgressor is, in other words, becoming confluent with Dharma. It should be mentioned that when the Buddha came into the world, he revealed Dharma which is regulative towards nirvana and with it, the end of all suffering. His revelation was meant to help, not those who could already perceive the Dharma or those who were incapable, but those beings who were in the middle, so to speak, who needed guidance.
That we are presently entangled with the Five Aggregates (mainly the physical) from which our image of the self is derived, makes nirvana virtually impossible to achieve. Consequently, instead of being free of the conditioned, we are bound to it. And by the proportion of attachment we are judged (karma) by the force of Dharma.
The only way out of this mess is for the self to distance itself from the Five Aggregates; to realize that I am not form, sensation, percepts (i.e., perceptual), volitional formations (i.e., experiences), or sensory consciousness. According to the Buddha, there should be a clear separation between the aggregates and the self so that he knows, referring to each aggregate, “This is not mine, this I am not, this is not my self.” By this method one is following the Buddha’s Dharma while acquiring a better understanding of nirvana which is for the self.