Essence of Religion in Kali Yuga
Srimad Bhagavatam it is repeatedly and clearly said that the essence of religion in the Age of Kali is the chanting of the holy name of Krishna.
Caitanya Caritamrta Adi lila 3.50
Only Way of Saving The World
In its present condition, the world can only be saved by introducing this sankirtana, this Krishna consciousness movement.
Purport on Srimad Bhagavatam 4.18.8
Difference Between Japa and Kirtana
When a Vedic mantra is chanted within the mouth so that only the chanter can hear, the chanting is called japa. But when such mantras are chanted loudly, it is called kirtana.
Purport on Srimad Bhagavatam 3.14.32
Yajna Recommended By Lord Chaitanya
Lord Chaitanya, however, has recommended only one yajna, or sacrifice, called the sankirtana-yajna, the chanting of Hare Krishna, in which everyone can take part. Thus both devotees and fruitive workers can derive equal benefit from the performances of sankirtana-yajna.
Purport on Srimad bhagavatam 1.16.20