The first business should be to preach to the devotees. It is better to maintain a devotee than to try to convince others to become devotees. It is the duty of the GBC to maintain the devotees, keep them in the highest standard of Krishna Consciousness, and give them all good instruction, and let them go out and preach for making more devotees.
(From Srila Prabhupada's letter to Satsvarupa – Los Angeles 16 June, 1972)