The practice of zikr is meant to make that capacity in the heart in order to turn the heart into the ear. Every repetition of zikr is like carving something with a chisel. By carving a part of the heart, it may become hollow and it has the capacity to receive all that comes. The sound has power upon heart and soul. When you are given an exercise, its power is the same as the word or the meaning of the word. Therefore one must cut out the part that hinders the heart to do its proper work. The power of the word is such that all things can be accommodated by it, if one does it rightly. Wonders can be worked by the help of the word. Therefore a mantram is more powerful than a weapon. This is the experience of my whole life.