There are certain methods of ending fear through sadhana. Through these it is possible to become fearless. Fear can also be removed through scientific experiments. Thus what we can achieve through sadhana can also be achieved through scientific experiments. Here a question arises. The change wrought by sadhana over a long period, is effected by science in a short time. Why then undertake long-term sadhana at all? Why waste one's energy? Why not take the help of science to change one's habits or personality? It is natural to raise a question like that.