Dear friends ,
sadhana is for controlling the mind . In the initial stages it makes the mind disciplined .As it progresses sadhana becomes a part of the breath.Here by sadhana I do not mean exactly daily ritual of puja , or reciting of sthothras ( though it is not unimportant). It is contemplation on 'om'. OM is the mahamanthra There is no need to spend hours and hours . We can do that for 10 minutes in the morning and 10 minutes before going to bed . Sadhana gives chittha shuddhi .