The Sankirtana devotees are very very dear to Krishna. Because you are doing the field work of book distribution, Krishna has immediately recognized them as true servants. Just like during war time, a farm boy or ordinary clerk who goes to fight for his country on the front, immediately becomes a national hero for his sincere effort. So Krishna immediately recognizes a preacher of Krishna consciousness who takes all risks to deliver his message. It is called Dhira vrata - determination. These boys and girls are mahatmas
Letter to Uttamasloka Prabhu, 11 December, 1975