It is seen in case of those who have begun to do spiritual practices and Japa and meditation that the more they try to concentrate the mind on the Ishta, the more vehemently the mind rebels and runs after all sorts of irrelevant nonsense. The mind formerly used to be engaged in external pursuits and be attracted towards sense-objects by its very nature,and so there was no conflict. No sooner is an attempt made to control the mind, to draw it away from external objects and to make it look within, by discrimination between the real and the unreal, then it rebels. The force of a river increases a hundredfold if an attempt is made to dam it. And if that mighty force - if the tremendous power that is generated thereby- is turned to some useful and desired purpose, a thousandfold result is obtained.