Whenever I ger report of my books selling, I feel strength. Regarding book sales figures, please endeavor in this way. This is the only solace of my life. When I hear that my books are selling so nicely, I become energetic like a young man. – Srila Prabhupada, Sep 1974.
Teach them Krishna consciousness at early age.
Satisfaction of the soul can only be obtained by questions and answers on the subject of Krishna.
Srimad Bhagavatam 1.2.5,
If you want to learn how to love God or Krishna, then study
The Quest for Enlightment, Chapter 7,