Discard all you are not and go ever deeper. Just as a man digging a well discards what is not water, until he reaches the water-bearing strata, so must you discard what is not your own, till nothing is left which you can disown. You will find that what is left is nothing which the mind can hook on to. You are not even a human being. You just are - a point of awareness, co-extensive with time and space and beyond both, the ultimate cause, itself uncaused. If you ask me "Who are you?", my answer would be: "Nothing in particular. Yet, I am." 

 Sri Nisargadatta Maharaj, I AM THAT