Sometime back I saw this article on the Prabhupada News website that I saved to my files because it is a good assortment of quotes.
You Can Directly Associate With Srila Prabhupada by Reading His Books
compiled by Mahesh Raja
…. it is described here that ONE HAS TO ASSOCIATE WITH LIBERATED PERSONS NOT DIRECTLY, PHYSICALLY, BUT BY UNDERSTANDING, THROUGH PHILOSOPHY AND LOGIC, THE PROBLEMS OF LIFE. (Srimad-Bhagavatam – 3.31.48 Purport)
Prabhupada: JUST FOLLOW HIS ORDER. SPIRITUAL MASTER IS ALONG WITH YOU BY HIS WORDS. Just like my spiritual master is not physically present, but I am associating with him by his words. (Lecture – London, August 18, 1971)
The Hare Krishna Movement 