The holy name is not dutybound to bestow anything on us, such as better results in our activities. Rather, the real result of our other activities—whether we are doing book distribution or other services—is to increase our dependence on the holy name. Don’t think that just because you are chanting the holy name you will automatically be able to distribute a lot of books. Book distribution can become an external activity if we are not careful. Certainly it is purifying to distribute books, but it can also become external if we lose our sense of dependence on Krishna and are thinking more of the results than the service itself.
(LFD, Vol2, Chanting Purely, Pg 107, 2nd paragraph)