Atma is brahman

 Atma the self is brahman

Brahman means the light of all lights

The light of consciousness

Consciousness that is not limited by anything else other than itself

I am the light of all lights

I alone am the reality 

I 

You and I are mere words

This and that are mere words

Word and meanings are not real

They are mithya , or appear to be real

They appear to exist

But they have no independent existence

I am the existence , the only existence

So when we say , this exists, that exists,

The exists is myself the light of consciousness

and the 'this' and 'that' are the words and their meanings

Vacharambanam vikaro namadheyam, mrtka eva satyam

I alone illumine these names and forms

And the names and forms appear to exist , with borrowed existence

and this existence is I alone

Ishvara or god, is the source of this universe, and I am that source

Ishvara with maya shakti is the lord of this universe, and this maya shakti is mithya

I am the existence that enlivens and sustains this maya shakti

In me maya shakti is, and with this maya shakti I appear as bhagavan, the benevolent one

I manifest this universe with my maya shakti, and rule it and resolve it back

I have total control over my maya shakti and this universe and its beings, I run this leela

This is the truth that is known from the upanishads 

With the grace of the guru and the lord

With a guru any jiva can know this truth and be liberated forever from this confusion that leads to samsara

One attains ones own real nature , which is truth, beauty and self shining and whole and spotless or faultless.