7 - Great Ones, Perfect Beyond Learning, Utter No Words of Teaching
Subhūti, what do you think? Has the Tathāgata attained the consummation of incomparable enlightenment? Has the Tathāgata a teaching to enunciate?
Subhūti answered: As I understand Buddha's meaning there is no formulation of truth called consummation of incomparable enlightenment. Moreover, the Tathāgata has no formulated teaching to enunciate. Wherefore? Because the Tathāgata has said that truth is uncontainable and inexpressible. It neither is nor is not.
Thus it is that this unformulated principle is the foundation of different systems of all the sages.