Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 51

Sanskrit:

कलेर्दोषनिधे राजन्नस्ति ह्येको महान् गुण: ।कीर्तनादेव कृष्णस्य मुक्तसङ्ग: परं व्रजेत् ॥ ५१ ॥

ITRANS:

kaler doṣa-nidhe rājannasti hy eko mahān guṇaḥkīrtanād eva kṛṣṇasyamukta-saṅgaḥ paraṁ 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 Kṛṣṇa mahā-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, Śukadeva Gosvāmī 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 Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare, especially in this fallen age.