This _brahma_ is of two sorts, absolute and conditioned; but it is ultimately defined as 'breath.' Whenever it is convenient, 'breath' is regarded by the commentators as ego, 'spirit'; but one can scarcely escape the conviction that in many passages 'breath' was meant by the speaker to be taken at its face value.

It is the vital power.

With this vital power (breath or spirit) one in dreamless sleep unites.

Indra has nothing higher to say than that he is breath (spirit), conscious and immortal.

Eventually the soul after death comes to Indra, or gains the bright heaven.