This is a very nice compilation of quotes on the importance of writting based on the works of Srila Prabhupada.
“All students should be encouraged to write some article after reading Srimad-Bhagavatam, Bhagavad-gita and Teachings of Lord Caitanya. They should realize the information, and they must present their assimilation in their own words. Otherwise, how they can become preachers?”
(Letter to Brahmananda — Los Angeles, July 1, 1969)