Krsna-katha is the only remedy for all people of the world because it can situate one in pure consciousness of the self and liberate one from material bondage. To preach krsna-katha all over the world, as recommended by Lord Caitanya, is the greatest missionary activity, and all sensible men and women of the world may join in this great movement started by Lord Caitanya.

From Srila Prabhupada’s purport to SB 3.5.11