Raman Maharshi used to give only one meditation to everyone, whosoever would come to him: just to go on and on pondering, observing, watching, witnessing one thing — to let this question become so utterly your existence that it persists even when you are asleep — Who am I?
And it has not to be repeated like a mantra. If you repeat it like a mantra you will have missed the point; it is not a mantra, it is an inquiry, and the greatest inquiry there is.
It has not to be used as a meditation technique, it has to become your very life. Walking, let the inquiry be there — 'Who is walking?' Listening right now, let the inquiry be there — 'Who is listening?'
And finally the inquiry has to penetrate to such profound depths that when you ask 'Who am I?' the inquiry is there — 'Who is asking this question?'
Move to the innermost centre of your being. This inquiry is a movement withinwards. And this single question can solve all the problems; it is a master key: it unlocks all the locks.
Truth is within ourselves; it takes no rise
From outward things, whate'er you may believe.
Your belief is not going to change the nature of things.
OSHO