One verse

Srimad Bhagavatam 6.2.12

6.2.12

नैकान्तिकं तद्धि कृतेऽपि निष्कृते मन: पुनर्धावति चेदसत्पथे । तत्कर्मनिर्हारमभीप्सतां हरे- र्गुणानुवाद: खलु सत्त्वभावन: ॥ १२ ॥

naikantikam tad dhi krte ’pi niskrte manah punar dhavati ced asat-pathe tat karma-nirharam abhipsatam harer gunanuvadah khalu sattva-bhavanah

na
not
aikantikam
absolutely cleansed
tat
the heart
hi
because
krte
very nicely performed
api
although
niskrte
atonement
manah
the mind
punah
again
dhavati
runs
cet
if
asat-pathe
on the path of material activities
tat
therefore
karma-nirharam
cessation of the fruitive reactions of material activities
abhipsatam
for those who seriously want
hareh
of the Supreme Personality of Godhead
guna-anuvadah
constant chanting of the glories
khalu
indeed
sattva-bhavanah
actually purifying one’s existence

The ritualistic ceremonies of atonement recommended in the religious scriptures are insufficient to cleanse the heart absolutely because after atonement one’s mind again runs toward material activities. Consequently, for one who wants liberation from the fruitive reactions of material activities, the chanting of the Hare Krsna mantra, or glorification of the name, fame and pastimes of the Lord, is recommended as the most perfect process of atonement because such chanting eradicates the dirt from one’s heart completely.