Why preach?

Everywhere the glories of Lord Caitanya Mahaprabhu will be spread. So by His
grace, we are doing that in America, in Europe, Africa, Australia. Village
to village, town to town we are preaching the mission of Sri Caitanya
Mahaprabhu.
So why we are preaching? What is the necessity of preaching? The necessity
is to make them happy.
>>> Ref. VedaBase => Arrival Address — Paris, August 11, 1975