In the Padma Purāṇa also it is stated, "The chanting of the Hare Kṛṣṇa mantra is present only on the lips of a person who has for many births worshiped Vāsudeva." It is further said in the Padma Purāṇa, "There is no difference between the holy name of the Lord and the Lord Himself. As such, the holy name is as perfect as the Lord Himself in fullness, purity and eternity. The holy name is not a material sound vibration, nor has it any material contamination." The holy name cannot, therefore, be chanted offenselessly by one who has failed to purify his senses. In other words, materialistic senses cannot properly chant the holy names of the Hare Kṛṣṇa mahā-mantra. But by adopting this chanting process, one is given a chance to actually purify himself, so that he may very soon chant offenselessly.
Caitanya Mahāprabhu has recommended that everyone chant the Hare Kṛṣṇa 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. For persons who are not inclined to clean the dust from their hearts and who want to keep things as they are, it is not possible to derive the transcendental result of chanting the Hare Kṛṣṇa mantra. One should, therefore, be encouraged to develop his service attitude toward the Lord, because this will help him to chant without any offense. And so, under the guidance of a spiritual master, the disciple is trained to render service and at the same time chant the Hare Kṛṣṇa mantra. As soon as one develops his spontaneous service attitude, he can immediately understand the transcendental nature of the holy names of the mahā-mantra.