All Acaryas on our line have written substantially on the Science of God-consciousness

“I am glad to read in your letter you are going to the universities to preach. The universities are very important places because there there are men who can appreciate our philosophy. So when you speak in the classroom, just quote from any of my books and then try and explain the meaning in your own words and the students will appreciate it very much.”
Srila Prabhupada letter to Tulsi das, November 9, 1970
“We need so many preachers who are soundly versed in the scriptures to convince the world to take to Krishna Consciousness. I am glad that you and the others are each writing one hour daily essays. That is parampara. All of our previous acaryas on our line have written substantially on the science of God-consciousness, so I would also like all my students to do this and I am very encouraged by this nice program you have initiated.”
Letter to Vrindavan candra, November 9, 1970

“So study my books and reproduce the purports in your own language. You should instruct your temple presidents to preach like this. This is preaching. We haven’t got to invent something by our fertile brain for preaching. Everything is there. One who is expert for presenting these things before the audience so they can conveniently understand, this is a successful preacher. You have only to speak what Krsna has said. Then you become a preacher.”
Letter to Jagadisa das, November 9, 1975
“This is Caitanya Mahaprabhu’s blessings that everyone of us should become a sadhu and preach Krsna consciousness. So far Krsna consciousness is concerned, we have got new and sufficient number of books and if we read them carefully and reproduce the purports in our own language, that is perfect preaching.”
Letter to Tripurari, November 9, 1975