[FelikTen]

The Buddha did not speak of any notion of "ultimate reality".

Is Dhamma-Niyama ultimate reality?

"Monks, whether or not there is the arising of Tathagatas, this property stands — this steadfastness of the Dhamma, this orderliness of the Dhamma: All processes are inconstant.

"The Tathagata directly awakens to that, breaks through to that. Directly awakening & breaking through to that, he declares it, teaches it, describes it, sets it forth. He reveals it, explains it, & makes it plain: All processes are inconstant.

"Whether or not there is the arising of Tathagatas, this property stands — this steadfastness of the Dhamma, this orderliness of the Dhamma: All processes are unsatisfactory.

"The Tathagata directly awakens to that, breaks through to that. Directly awakening & breaking through to that, he declares it, teaches it, describes it, sets it forth. He reveals it, explains it, & makes it plain: All processes are unsatisfactory.

"Whether or not there is the arising of Tathagatas, this property stands — this steadfastness of the Dhamma, this orderliness of the Dhamma: All phenomena are not-self.

"The Tathagata directly awakens to that, breaks through to that. Directly awakening & breaking through to that, he declares it, teaches it, describes it, sets it forth. He reveals it, explains it, & makes it plain: All phenomena are not-self."

Dhamma-niyama Sutta