So especially you must encourage the students to read our books throughout the day as much as possible, and give them all good advice how to understand the books, and inspire them to study the things from every point of view. Better to boil the milk very vigorously and make it thick and sweet–that is the best progress. So let us concentrate on training our devotees very thoroughly in the knowledge of Krsna consciousness from our books, from tapes, by discussing always, and in so many ways instruct them in the right propositions.

(From Srila Prabhupada's letter to Hamsaduta, June 22, 1972)