Drink more and you become a drunkard. Similarly chant more and you become a perfect chanter.
Simply by chanting the Hare Krishna mantra one revives his original relationship with God.
Srimad Bhagavatam 7.7.39,
The chanting itself purifies us and as the heart becomes purified, the Holy name is revealed to us as being non-different than Lord Krishna.
Caitanya Mahaprabhu has recommended that everyone chant the Hare Krishna mantra just to cleanse the dust from the heart. If the dust of the heart is cleansed away, then one can actually understand the importance of the holy name.
Nectar of Devotion, Chapter 12,
Chanting the Hare Krishna mahamantra, vanquishes all the effects of sinful activities.