If both will power and self discipline are together u can boss ur mind or take control over it.The stronger they are the more control u can gain over ur thoughts.
when u gain control over your mind u are full with happiness and peace.No other sway can disturb u or any other circumstances can disturb u and ur mind.this might sound to unreal but u can feel it when u will face this situation.when u wish to overcome ur lazziness,inner power,mind power u must use the path of self discipline and will power.exercise is another way to gain more will power.