Blessed One, what is meant by this term Nirvana?" Replied the Buddha, "When the self-nature and the habit-energy of all the sense-discriminations, includ- ing ego (alaya), intellect (manas), and the faculty of judgment (manovijnana), from which issue the habit-energy of wrong speculations--when all these go through a revulsion, I and all the Buddhas declare that there is Nirvana. The way and the self-nature of this Nirvana is emptiness, which is the state of reality."

(The Lankavatara Sutra)