Jayapataka Swami: This is a stage in our progress of chanting. Where the mind is wandering in different things, different directions. When I had this problem, I kept a notebook, and whenever my mind would think of something, I have to do this, I have to do that, I will write it in my notebook, and put the notebook back in my pocket, and then concentrate on chanting. Now if anyone is chanting, I cannot do anything else. My mind goes to the chanting. And just all I can think about is the chanting! So this is a stage, first the mind goes here and there, and then when you advance, your mind gets fixed on the chanting, it cannot go anywhere else! So keep chanting, and eventually your mind will become purified!  Hare Krsna!