Now we have got so many students and so many temples but I am fearful that if we expand too much in this way we shall become weakened and gradually the whole thing will become lost. Just like milk. We may thin it more and more with water for cheating the customer, but in the end it will cease to be any longer milk. Better to boil the milk now very vigorously and make it thick and sweet. That is the best process. So let us concentrate on training our devotees very thoroughly in the knowledge of Krishna Consciousness from our books, from tapes, by discussing always, and in so many ways instruct them in the right propositions.
Srila A. C. BhaktivedantaSwami Prabhupada
(Letter to Hamsaduta)