Preching means book distribution.
I want that you all my students, shall very vigorously try for this book distribution.
So I am always emphasizing book distribution. It is the better kirtana. It is better than chanting. Of course chanting should not stop, but book distribution is the best kirtana.
[Letter to Srutadeva Dasa 24 Oct 1974]
These books are so potent that anyone who reads them is sure to become krishna Conscious, so it is a very valuable service to distribute our books.
Book distribution is also chanting. These books I have recorded and chanted and they are transcribed. It is spoken kirtanas. So book distribution is also chanting. These are not ordinary books. It is recorded chanting. Anyone who reads, he is hearing. Book distribution must not be neglected. – Letter to: Rupanuga: Mayapur, 19 October, 1974, Atlanta.
Chanting Hare Krishna With Mridangas and Kartals…. this is also Kirtan; when you Distribute books, that is also Kirtana.