True meditation only begins when initially, using your discrimination, you cut off everything that does not go with the 'I am' - which includes the body-mind identification, which is the major obstacle. You should not have the feeling "I am so-and-so meditating" or "I am sitting at this particular place, in this posture, meditating on..." all these externalities must go. It should be only the knowledge 'I am' that should be meditating on itself. It is only when the purity of 'I am' is maintained in meditation that there is a chance that it will disappear.