The reply of Śāriputra, the chief disciple of the Buddha, to a direct question ‘What is Nibbāna?’ posed by a Parivrājaka, is identical with the definition of Asaṃkhata given by the Buddha:

‘The extinction of desire, the extinction of hatred, the extinction of illusion.’

‘The abandoning and destruction of desire and craving for these Five Aggregates of Attachment: that is the cessation of dukkha.’

‘The cessation of Continuity and becoming (Bhavanirodha) is
Nibbāna.’

And further, referring to Nirvāṇa the Buddha says:

‘O bhikkhus, there is the unborn, ungrown, and unconditioned. Were there not the unborn, ungrown, and unconditioned, there would be no escape for the born, grown, and conditioned. Since there is the unborn, ungrown, and unconditioned, so there is escape for the born, grown, and conditioned.’

‘Here the four elements of solidity, fluidity, heat and motion have no place; the notions of length and breadth, the subtle and the gross, good and evil, name and form are altogether destroyed; neither this world nor the other, nor coming, going or standing, neither death nor birth, nor sense-objects are to be found.’

Because Nirvāṇa is thus expressed in negative terms, there are many who have got a wrong notion that it is negative, and expresses self-annihilation. Nirvāṇa is definitely no annihilation of self, because there is no self to annihilate. If at all, it is the annihilation of the illusion, of the false idea of self.