4).

In this Upanishad fire, sun, moon, and lightning die out, and reappear as _brahma_.

This is the doctrine of the _Goetterdaemmerung_, and succession of aeons with their divinities (2.

12).

Here again is it distinctly stated that _pr[=a]na_, breath, is _brahma_; that is, spirit is the absolute (2.
13).
What becomes of them that die ignorant of the ego?
They go either to the worlds of evil spirits, which are covered with darkness--the same antithesis of light and darkness, as good and evil, that was seen in the Br[=a]hmanas--or are reborn on earth again like the wicked (_[=I]c[=a]_, 3).
It is to be noted that at times all the parts of a man are said to become immortal.