Performing Kirtana
Generally kirtana is performed with mrdanga and karatalas, but if somebody is expert instrument player, he can be admitted to join Sankirtana.
Letter to Jadurani — New Vrindaban 26 May, 1969.
Ecstasy of The Sankirtana Movement
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
Knowing Everything Perfectly
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
Formula For Deliverance of The Fallen Souls
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
Glories of Performing Sankirtana
Sri Chaitanya Mahaprabhu is the inaugurator of the sankirtana movement, anyone who performs sankirtana to please the Lord is very, very glorious. Such a person has perfect intelligence, whereas others are in the ignorance of material existence.
Purport on Srimad Bhagavatam 5.19.24
Maximum Display of Human Mercy
Spending fifty percent for the service of the Lord or for propagation of spiritual knowledge in society by way of the sankirtana-yajna is the maximum display of human mercy.
Purport on Srimad Bhagavatam 1.17.42