Srila Prabhupada rose in the middle of the night for many years translating and writing his purports to share his personal ecstasies for our understanding and upliftment. He arranged the book printing and organized the book distribution driven by his Guru Maharaja's order and by his deep compassion for us. Devotees would write to him to tell him how many books they distributed, and he would ask that they double the numbers, especially in the month of December. In this connection big numbers were important to him, and they gave him great happiness. The more books distributed, the more souls could hear about the Lord and His devotees.
December is especially favorable for book distribution because in this month Krsna had the transcendentally powerful dialogue with Arjuna on Battlefield of Kuruksetra so mystically presented in the Bhagavad-gita. The Indian people have great respect for this historic occasion. In the West of course Christmas falls in December, and people are very inclined to buy books either for themselves or as Christmas gifts. Devotees worldwide distribute many more books in this month than in any other month. Srila Prabhupada and the guru parampara shower special mercy on any devotee that enters the Christmas marathon mood.
Print books, distribute profusely, and that will be the best preaching work. What will your three minutes preaching work—But if they buy one book, it may turn their life. (Srila Prabhupada Letter to Bhagavan, 5th November, 1972).