‘This Unformulated Principle‘ says the Diamond Sutra ‘is Uncontainable and Inexpressible’. [‘Unformulated Principle‘? Formulation is the essence of Principle. Is that a Self-Negating Expression sneaking by?]
The literature of this period shows that Siddhartha Gautama’s formal schooling, that of a high-born Kshatriya Prince, was firmly in the classic Dharmic paradigm.
It was assigned to five established Dharmic teachers and a supporting crew of noted scholars. The first Upaniṣads would have been standard fare for every beleaguered student of his rank and of his day.
Siddhartha Gautama’s chosen name for himself was not as ‘The Buddha’ [a later appellation] but as the Tát-āgathā [literally, ‘That-Gone’] again, the same Tát [‘That’] of the Rig Veda.
A Tát-āgathā is one: ‘Entered in Tát’ [‘That’]. It says nothing about any ‘Object’ [such as an imagined ‘That’]. It is all about the Subject. Or rather, the absence of it.
In the highest tradition of the Buddha-Dharma one does not worship The Buddha, which is easy enough. The struggle is to become a Tat-āgatha.