Of all sacriﬁces, the chanting of Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare is the purest representation of Krishna.
One may or may not know the power of chanting the Hare Krishna mantra, but if one chants the holy name he will become free from all sinful reactions.
Srimad Bhagavatam 6.2.18,
If we hear properly, the holy name will enter through our ears into the region of our heart and shower down nectar. When we are lost in the ocean of nectar, we will see Krishna.
Chanting of the Hare Krishna maha-mantra is potent always, but it is especially potent in this Age of Kali.
Srimad Bhagavatam 8.5..23