The great endeavor to control the mind may actually contribute to fatigue while chanting, but what especially contributes to fatigue is that we have no taste. If there is no taste, chant anyway as a matter of duty and taste will eventually come. We will not be able to force taste for the holy name. Taste comes only by the Lord’s will. To the degree that we are determined to chant despite a lack of taste or that we become tired by the effort, we will gradually begin to feel progress in our chanting.
(LFD, Vol2, Chanting Purely, Pg 105, 3rd paragraph)