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
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
Performing kirtana and hearing the vibration of the sound Hare Krishna is actually seeing the Supreme Personality of Godhead directly.
Purport on Srimad Bhagavatam 7.4.25-26