Its an essence. That is it is a/the key/core reality creating and enforcing concept/idea of an entire pattern, system, body of knowledge or area of human endeavor.

What is the paradigm of paradigms? It is reality creating ideas themselves.

So what is the ultimate paradigm? Probably grace which is the active unitary integration of opposites/dualities into a trinity/thirdness greater oneness which is also the very process of the intellectual discipline of Wisdom. Finally, because grace is

1. graciousness/lovingness which is the recognized superlative ethic and state of being and
2. is the key unitary experience and simultaneous expression of love it is also
3. the active as in continuous temporal universe reality creating concept and form of trinity/thirdness it is also a quadrinity/fourthness, and possibly cosmic reality creating concept, as well.