When caught up in the mind ask 'who is?'
naturally 'I am'
who or what is this 'I'?
before 'I am this' or 'I am that' or any other concept or identification
see that 'I' indicates a wordless sense of self
a silent feeling of oneself 'I,...I,...I,'
a sense of self existence, that 'I am'
From 'I Am That' Talks with Nisargadatta Mahraj
(excerpted from the appendix and foreword)
The Nisarga Yoga, the ‘natural’ Yoga of Maharaj, is disconcertingly simple -- the mind, which is all-becoming, must recognise and penetrate its own being, not as being this or that, here or there, then or now, but just as timeless being.
To delve into the sense of ‘I’ -- so real and vital -- in order to reach its source is the core of Nisarga Yoga. Not being continuous, the sense of ‘I’ must have a source from which it flows and to which it returns. This timeless source of conscious being is what Maharaj calls the self-nature, self-being, swarupa.
This dwelling on the sense ‘I am’ is the simple, easy and natural Yoga, the Nisarga Yoga. There is no secrecy in it and no dependence; no preparation is required and no initiation. Whoever is puzzled by his very existence as a conscious being and earnestly wants to find his own source, can grasp the ever-present sense of ‘I am’ and dwell on it assiduously and patiently, till the clouds obscuring the mind dissolve and the heart of being is seen in all its glory.
Return again and again to ‘I am’ until it is your only abode, outside of which nothing exists; until the ego as a limitation of ‘I am’, has disappeared. It is then that the highest realisation will just happen effortlessly.