Discipline is how this world works otherwise there would be war all around and strong powers try to dominate the weaker one. Discipline never ever costs and IF you can't maintain discipline in your life then your expenses would always be more than your earnings and you face setbacks at every phase of life and you just can't be responsible to take care of parents and even facing difficulty in raising up your child and that is how be discipline means everything and same thing is applied in Trading as well.