Devotees of Krsna are on the front lines of preaching

Srila Prabhupada told us long ago we can take good instructions from anyone that describes the genuine devotees of Krsna 

“It is not the critic that counts, not the man who points out how the strong man stumbles, or whether the doer of the deeds could of done them better. 

The credit belongs to the man who is actually in the arena, who spends himself in a worthy cause, who at the best knows in the end the triumph of high achievements, and who at worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat”