My special mission is to complete the Srimad-Bhagavatam in 60 volumes, so the most important thing on the part of the International Society is to organize the sales propaganda, of all the books that you are publishing. If there is less sales propaganda then the outlet of the books will be bottlenecked, and smooth printing work will stop. You have not only to print, but you have to sell them.
Letter to Brahmananda, 20 February, 1968