Srimad Bhagavatam Canto 12, Chapter 03, Text 51

SB 12.3.51

kaler dosa-nidhe rajann
 asti hy eko mahan gunah
kirtanad eva krsnasya
 mukta-sangah param vrajet
 
Translation: 
 
My dear King, although Kali-yuga is an ocean of faults, there is still one good quality about this age: Simply by chanting the Hare Krsna maha-mantra, one can become free from material bondage and be promoted to the transcendental kingdom.
 
Purport: 
 
After mentioning the innumerable faults of this Age of Kali, Sukadeva Gosvami now mentions its one brilliant aspect. Just as one powerful king can kill innumerable thieves, one brilliant spiritual quality can destroy all the contamination of this age. It is impossible to overestimate the importance of chanting Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare, especially in this fallen age.
Srimad Bhagavatam Canto 12, Chapter 03, Text 50
Srimad Bhagavatam Canto 12, Chapter 03, Text 52