Lets us put it simply; Brahman projected the illusion
Lets us put it simply;
Brahman projected the illusion we call manifestation or creation...( it never really happened though).
The energy illusion is made up of many small i am thoughts or egos like the forest is the sum total of the trees.
So the ego cannot destroy itself as it did not make itself so the Universal Self has to do that.As it does not Act a body is needed hence the guru who is the Self and kills the ego in the final instance...
There you are the whole book....T