So we require hundreds and thousands of spiritual masters who have understood this Krishna science and have preached it all over the world. That is the problem. To this end, we have formed this society and we invite all sincere souls to take part in the society and become a spiritual master, and preach this science all over the world. There is a great need for this knowledge.

Srila Prabhupada – Lecture BG 4.34–38 – New York 1966