Nirvāṇa

In plain terms

Nirvāṇa is the third of the four noble truths: given that suffering arises from craving, its cessation is possible, and that cessation is nirvāṇa.

The metaphor in the word is a flame going out. What goes out is the burning - craving, aversion, confusion - not the person, and the tradition spends a great deal of effort blocking the reading that it is annihilation.

What it is positively is much harder to say, and the texts mostly decline to. Asked what happens to a liberated person after death, the standard response is that the question does not apply - like asking which direction a fire went when it went out.

In English the word now means a state of blissful transcendence. That is close to the reverse of a term whose whole force is the ending of a fire.

As a philosopher would put it

Nirvāṇa is standardly divided into two. Sa-upādisesa nibbāna is attained in life: craving has been extinguished, and the aggregates continue until death. Anupādisesa nibbāna follows the death of such a person, and it is here that the texts refuse elaboration.

The unanswered questions are the key evidence. The four alternatives - that a liberated one exists after death, does not, both, or neither - are all set aside, which the catuṣkoṭi structure marks as a rejection of the question's presupposition rather than as agnosticism.

The Māhayāna develops the position substantially. Nāgārjuna argues that nirvāṇa and saṃsāra are not two: there is not the slightest difference between them, since both are empty of intrinsic nature - which reframes liberation as a change in relation rather than a transfer to a different place. The bodhisattva ideal follows, in which final nirvāṇa is deferred.

What is actually disputed

Whether nirvāṇa is a state or a cessation.

The positive reading treats it as an unconditioned reality, and the Pāli texts contain passages describing an unborn, unmade, unconditioned - without which, they say, there would be no escape from the conditioned. The negative reading treats it strictly as the cessation of craving, with any further characterisation being the reification the analysis exists to prevent.

Both readings are textually supported and the dispute is ancient.

The deeper problem is the one the unanswered questions mark. If a liberated person neither exists nor does not exist after death, then the framework's central term resists exactly the description we would need in order to know what is being offered. Defenders regard this as appropriate to what is being described; critics regard it as an unfalsifiable position defended by declaring the question improper.