The Eternal Atman.
The Self is your real Self, the Atma.
You are a spirit of consciousness, of the one consciousness that is the source of eternal being.
You are Atma and Atma is identical to Paramatma. So at your core you are identical to what is called ‘God’.
This Atma is reality because Atma is unchanging, eternal and self effulgent consciousness.
The mind and the body on the other hand are not unchanging, eternal or self effulgent.
The body is the creation of nature and the mind is the creation of the senses.
Both the body and the mind have relative beingness, their beingness depends on what the body eats and what the mind perceives through the senses of the body.
The body has a beginning and the body has an end. The mind has beginnings and endings constantly, it is like the reflection of the sun bouncing off the movement of water.
We are having this relative experience as eternal beings to realise our true nature as the eternal Atman and to learn how to break out of the bindings of attachment.
“The only useful purpose of the present birth is to turn within and realise the Self. There is nothing else to do.”