6).

And when it is said, in _Brihad [=A]ran_.
1.4.1, that "In the beginning ego, spirit, _[=a]tm[=a],_ alone existed," one finds this spirit (self) to be a form of _brahma (ib._ 10-11).

Personified in a sectarian sense, this spirit becomes the divinity Rudra Civa, the Blessed One (_Cvet[=a]cvatara,_ 3.

5.
11).[30] In short, the teachers of the Upanishads not only do not declare clearly what they believed in regard to cosmogonic and eschatological matters, but many of them probably did not know clearly what they believed.

Their great discovery was that man's spirit was not particular and mortal, but part of the immortal universal.