The dualistic mind tries to understand non-duality but this is not possible.  And even if it gains a rudimentary understanding it won't satisfy.  The dualistic mind is capable of understanding many things in life and if it focuses hard enough and long enough a breakthrough usualy happens.  But, non-duality is a whole different paradigm; to understand non-duality it's of no use using a dualistic mind.  The gate way through is to answere the question 'Who Am I'.  Once you have seen clearly who you actualy are then non-duality is at your feet - indeed you are non-duality.  The search for identity, the true identity is what's needed.