Control of the thought process is the prescribed way to realization.  But control by whom or what? 

All of us are aware of how difficult it is to sit in meditation even for a few moments, without our thoughts running haywire.  The control prescribed for attaining a higher state is the continuing and without any let up of concentration and awareness of the Paramathma. 

The establishment of who controls whom and what in the mind is very important to establish in the mind before the process of unrelenting focus begins. 

CONTROL OF THE MIND HAS MANY DIFFERENT ASPECTS AS DETAILED IN THE PURANAS.  CONTROL, AS DESCRIBED IN THE PURANAS, ORIGINATES, NOT FROM A SUPPRESSION OF TEMPTATIONS OR URGES, BUT TO ENTIRELY ELIMINATE THEM.

WHEN SELF CONTROL IS ESTABLISHED,  ONE's LIFE MOVES AWAY FROM THE GRIP OF KARMIC FORCES AND PROBLEMS DISSIPATE.  CONSIDER THE EMOTION OF  ANGER AS AN EXAMPLE.  IN PLAIN LANGUAGE,  IF WE REFUSE TO GET ANGRY IN A SITUATION WHERE ANGER WAS EXPECTED,  THE SUBSEQUENT EVENTS ARE ALSO MODIFIED FROM ONE OF CONFLICT TO ONE OF CONCILIATION AND PEACE.   THIS IS HOW KARMA IS DEFEATED.  SO THE PROCESS OF LEARNING ABOUT THE BEHAVIOUR OF THE SELF IS INITIATED BY THE PROBLEMS OF THE EXTERNAL WORLD.  MODERN SCIENCE ON THE OTHER HAND, ATTEMPTS TO SOLVE EXTERNAL WORLD PROBLEMS BY GAINING KNOWLEDGE ON THE BEHAVIOUR OF MATERIALS.