Through the association of devotees, one can engage in the service of the Lord by hearing and chanting. Thus one can revive his dormant Krishna consciousness and sticking to the cultivation of Krishna consciousness, return home, back to Godhead, even in this life.
Unless one is a completely pure devotee, one cannot enjoy the transcendental bliss derived from chanting and dancing in the ecstasy of the sankirtana movement. Such ecstasy is not possible for an ordinary devotee.
Purport on Srimad Bhagavatam 8.3.20-21
The entire Krishna consciousness movement is based on the principles of the sankirtana movement inaugurated by Sri Chaitanya Mahaprabhu. Therefore one who tries to understand the Supreme Personality of Godhead through the medium of the sankirtana movement knows everything perfectly.
Purport on Srimad bhagavatam 7.9.38
Simply by accepting the sankirtana movement and chanting the Hare Krishna maha-mantra, the fallen souls of this Kali-yuga will be delivered.
Purport on Srimad Bhagavatam 8.5.23