A.C. Bhaktivedanta Swami Prabhupada, Picture Quotes
The elephant may take a very nice bath in the river, but as soon as it comes onto the bank, it throws dirt all over its body. What, then is the value of its bathing? Similarly, many spiritual practitioners chant the Hare Krishna Mahamantra and at the same time commit many forbidden things, thinking that their chanting will counteract their offenses.
A.C. Bhaktivedanta Swami Prabhupada, Picture Quotes
Any person who is chanting the holy names of Krishna (Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare) in course of chanting without offenses feels some transcendental pleasure and very quickly becomes purified of all material contamination.
Bhagavat Gita 9.2,
Srila Prabhupada.
Srimad Bhagavatam
The chanting of the Hare Krishna mantra is recommended even for persons who commit offenses, because if they continue chanting they will gradually chant offenselessly.
Purport on Srimad Bhagavatam 6.3.24
Chaitanya Caritamrta
By inducing the offenders to chant the Hare Krishna mantra, Lord Chaitanya Mahaprabhu exemplified the success of the Krishna consciousness movement.
Purport on Chaitanya Caritamrta Adi Lila 7.150
Lokanath Swami
Whole things start with the mind. If mind is not purified then the words, through the words and through the body we will be committing sins and offences.
Chaitanya Caritamrta
Of the nine processes of devotional service, the most important is to always chant the holy name of the Lord. If one does so, avoiding the ten kinds of offenses, one very easily obtained the most valuable love of Godhead.
Chaitanya Caritamrta Antya Lila 4.71