Srimad Bhagavatam (12:3:51):
कलेर्दोषनिधे राजन्नस्ति ह्येको महान् गुणः।
कीर्तनादेव कृष्णस्य मुक्तसंगः परं व्रजेत्।।
Kalerdoshanidhey rajannasthi hyeko mahăn gunaha |
Keerthanadeva Krishnasya muktasangaha param vrajeth ||
Indeed there is one great virtue possessed by the Kali age,
the storehouse of all evils, Oh King!
By merely chanting the names and glories of Sri Krishna,
one is freed from all attachments and reaches the Supreme.
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji