SB 7.9.39
naitan manas tava kathasu vikuntha-natha
sampriyate durita-dustam asadhu tivram
kamaturam harsa-soka-bhayaisanartam
tasmin katham tava gatim vimrsami dinah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
My dear Lord of the Vaikuntha planets, where there is no anxiety, my mind is extremely sinful and lusty, being sometimes so-called happy and sometimes so-called distressed. My mind is full of lamentation and fear, and it always seeks more and more money. Thus it has become most polluted and is never satisfied in topics concerning You. I am therefore most fallen and poor. In such a status of life, how shall I be able to discuss Your activities?
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Here Prahlada Maharaja represents himself as a common man, although he actually has nothing to do with this material world. Prahlada is always situated in the Vaikuntha planets of the spiritual world, but on behalf of the fallen souls he asks how, when his mind is always disturbed by material things, he can discuss the transcendental position of the Lord. The mind becomes sinful because we are always engaged in sinful activities. Anything not connected with Krsna consciousness should be understood to be sinful. Indeed, Krsna demands in Bhagavad-gita (18.66):
sarva-dharman parityajya
mam ekam saranam vraja
aham tvam sarva-papebhyo
moksayisyami ma sucah
“Abandon all varieties of religion and just surrender unto Me. I shall deliver you from all sinful reaction. Do not fear.” As soon as one surrenders unto the Supreme Personality of Godhead, Krsna, Krsna immediately relieves one of the reactions of sinful activities. Therefore one who is not surrendered to the lotus feet of the Lord should be understood to be sinful, foolish, degraded among men and bereft of all real knowledge because of atheistic propensities. This is confirmed in Bhagavad-gita (7.15):
na mam duskrtino mudhah
prapadyante naradhamah
mayayapahrta-jñana
asuram bhavam asritah
Therefore, especially in this Age of Kali, the mind must be cleansed, and this is possible only by the chanting of the Hare Krsna maha-mantra. Ceto-darpana-marjanam. In this age, the process of chanting the Hare Krsna maha-mantra is the only method by which to cleanse the sinful mind. When the mind is completely cleansed of all sinful reactions, one can then understand his duty in the human form of life. The Krsna consciousness movement is meant to educate sinful men so that they may become pious simply by chanting the Hare Krsna maha-mantra.
harer nama harer nama
harer namaiva kevalam
kalau nasty eva nasty eva
nasty eva gatir anyatha
To cleanse the heart so that one may become sober and wise in this Age of Kali, there is no value to any method other than the chanting of the Hare Krsna maha-mantra. Prahlada Maharaja has confirmed this process in previous verses. Tvad-virya-gayana-mahamrta-magna-cittah. Prahlada further confirms that if one’s mind is always absorbed in thought of Krsna, that very qualification will purify one and keep one purified always. To understand the Lord and His activities, one must free his mind from all contamination of the material world, and this one can achieve by simply chanting the Lord’s holy name. Thus one becomes free from all material bondage.