That which can only be cognized in a non-dual manner by the direct perception realizing it.
Ultimate truth and emptiness are synonymous.
To be cognized in a non-dual manner: the perception is free from the three dualistic modes:
- The appearance of subject and object as different.
- The appearance of an illusory (nominal) phenomenon.
- The appearance of inherent existence.
On the level of sentient beings there is only one consciousness that fulfills these criteria, which is the non-dual transcendental wisdom directly realizing emptiness.
It is the only antidote against ignorance and samsara, and synonymous with the truth of the path.