Knowledge is _brahma_ (2.4.1.

1; 6.1.

5-7).
In the Kena, where the best that can be said in regard to _brahma_ is that he is _tadvana_, the one that 'likes this' (or, perhaps, is 'like this'), there is no absorption into a world-spirit.

The wise 'become immortal'; 'by knowledge one gets immortality'; 'who knows this stands in heaven' (1.

2; 2.