Srila Prabhupada always emphasized that if we want to cure our diseased condition, we must constantly glorify the holy name, pastimes, and instructions of the Lord. The difficulty is that we have no taste for this constant chanting. Without this spontaneous attraction for chanting, we must voluntarily place ourselves in an environment which will push us in the direction of glorifying the Lord. Book distribution has the unique quality of providing this environment. Granted, sometimes we can become ritualistic in our efforts to sell Krishna conscious literature, and it may seem that we are failing to expand upon the glories of the Lord. But because our efforts are aimed at service to the Vaisnavas, by directly assisting them in spreading the Lord's glories, ultimately we are expanding the Lord's glories. Gradually we can become cured from our diseased condition and begin to develop more and more of an attraction to speak about the Lord in every circumstance.
Collected Letters: Volume 2, Preaching and Book Distribution.