✔ 最佳答案
Nirvana in sutra is never conceived of as a place, but the antinomy of samsara (see below) which itself is synonymous with ignorance (avijja). “This said: ‘the liberated mind/will (citta) which does not cling’ means Nibbana”[MN2-Att. 4.68]. Nibbana is meant specifically as pertains gnosis which ends the identity of the mind (citta) with empirical phenomena. Doctrinally Nibbana is said of the mind which no "longer is coming (bhava) and going (vibhav)", but which has attained a status in perpetuity, whereby "liberation (vimutta) can be said".
It carries further connotations of stilling, cooling, and peace; the realizing of nirvana is compared to the ending of avijja (ignorance) which perpetuates the will (citta/mind) from passing through samsara life after life, which causes (and is caused by) among other things craving, consciousness, birth, death, greed, hate, delusion, ignorance. Nirvana, then, is not a place nor a state, it is an absolute truth to be realized, and a person can do so without dying. When a person who has realized nirvana dies, his death is referred as his parinirvana, his fully passing away, as his life was his last link to the cycle of death and rebirth (samsara), and he will not be reborn again. Buddhism holds that the ultimate goal and end of existence is realization of nirvana; what happens to a person after his parinirvana cannot be explained, as it is outside of all conceivable experience.
參考: Nirvana can thus happen anywhere; it is within you. Achieve it.