To reach Nirvana is to transcend human suffering. There are two types of Nirvana.

Boddhisatvas and Ahrats reach Nirvana and abide in Nirvana. But they are deluded by Nirvana, and therein lies the remainder of their suffering. In Hinduism, this is roughly equivalent to the realization of Atman as the witness of individual existence.

Buddhas transcend Nirvana and reside in a place beyond the distinction between Nirvana and Samsara, which has been called “the birthplace of Buddhas”. They see no difference between the two. They have completely extinguished their suffering. Their Nirvana is called non-abiding. In Hinduism, this is roughly equivalent to the realization of Brahman, which is beyond individual existence.

To transcend Buddhahood is to become an ordinary person, ultimately innocent and ultimately free. The highest attainment is the attainment of non-attainment. There was nothing to attain, nowhere to go, all is here, nothing else is there. Suffering, Nirvana, Samsara, enlightenment, Buddhahood, deathlessness - all is forgotten. One has relaxed totally. Only life remains, in its unadulterated purity and utter ordinariness.

In Hinduism, this is roughly equivalent to the realization of Para Brahman. Para Brahman does not perceive Brahman, just like one who has transcended Buddhahood does not perceive Nirvana.