As to the Nirvanas discriminated by the philosophers: there really are none. Some philosophers conceive Nirvana to be found where the mind-system no more operates owing to the cessation of the elements that make up personality and its world; or is found where there is utter indifference to the objective world and its impermanency. Some conceive Nirvana to be a state where there is no recollection of the past or present, just as when a lamp is extinguished, or when a seed is burnt, or when a fire goes out; because then there is the cessation of all the substrata, which is explained by the philosophers as the non-rising of discrimination. But this is not Nirvana, because Nirvana does not consist in simple annihilation and vacuity.

(The Lankavatara Sutra)