In this age the spiritual revolution was recommended by Lord Caitanya Mahaprabhu. He demonstrated that the Yuga Dharma for this age is the Sankirtana chanting of the holy names. If we want the degraded mass of people to be elevated, we must stop their sinful activity. To stop sinful activity one must purify the mind and the best process for purifying the mass mind is the chanting of the maha mantra Hare Krishna. This can be done in public where everyone has a chance to hear and be purified.

We experience that people are becoming more friendly and helping our movement in America simply because we are performing this sankirtana yajna. I hope you can understand this. This movement is authorized and confirmed by great acaryas as well as the sastras and also by Lord Caitanya Himself Who is the Supreme Personality of Godhead, non different from Krishna.

From Srila Prabhupada's letter to Swami Jara Kumar — Vrindaban 20 August, 1974