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.
There is sufficient merit in our books that if you simply describe them sincerely to anyone he will buy. That art you must develop not the act of lying, convince them to give by your preacing the absoulute truth not by tricking. That is more mature stage of development of Krishna Consciounsness.
According to our purpose, Motivation & Sincerity Krishna reveals himself to us.
Knowledge of Scriptures is Transcendental. Knowledge of Books of this World is Material.