Sri, Sankara said: The world is unreal and Brahman alone is real. It means the birth, life and death, which takes place within the world, also is unreal.

 

There are many schools of thought in Hinduism based on Vedas. These schools of thoughts are add-ons. Therefore, these add-ons have to be bifurcated from original Vedic Religion, to get the pure Vedic essence.

Sri, Sankara said: The world is unreal and Brahman alone is real. It means the birth, life and death, which takes place  within the world, also is unreal. If birth, life and death are unreal, then the rebirth and reincarnation and Avataric concept has to be unreal. Thus, it is for the seeker to find out, on what standpoint the world becomes unreal, to know the Brahman, which is ultimate truth.

Causality taught in the Upanishads is only to enable us to understand the supreme truth of no-origination. The world is not different from the self and the self is not different from Atman and Atman is not different from Brahman. That the non-dual absolute appears as the diverse world is only an illusion. If it really became diverse then the immortal would become mortal.

The dualists who seek to prove the origination of the unborn, by that very enterprise try to make the immortal, mortal. Ultimate nature can never change - the immortal can never become mortal and vice versa.

Gaudapada quotes from the Upanishads: "There's no plurality here"; "The Soul through its powers appears to be many"; "those who are attached to creation or production or origination go to utter darkness"; "the unborn is never reborn, for what can produce it?”