Chanting is the most important of the nine processes of bhakti. Certainly, preaching is chanting. In other words, when we are preaching the glories of the Holy Name, the glories of Krishna’s qualities, and the glories of the Lord's pastimes, that is also chanting. Therefore, in this respect, I naturally would like to see you preaching, but a preacher must have an internal life as well, if he wants to continue to preach. This means we must always be trying to improve the quality of our chanting. We should chant with a serious desire to make progress in devotional service. We should be careful to not allow our chanting to become routine, ritualistic chanting. When we chant, we should chant with a desire to chant purely, without any offense, and free from anarthas. This requires practice, and it must be practiced daily.
MKV, Vol 2- Pg 17,(Letter From Niranjana Swami)