nāmno balād yasya hi pāpa-buddhir na vidyate tasya yamair hi śuddhiḥ [Padma Purāṇa, Brahma-khaṇḍa

namno balad yasya hi papa-buddhir
na vidyate tasya yamair hi suddhih
[Padma Purana, Brahma-khanda 25.16]
To think that since the Hare Krsna mantra can counteract all sinful reactions one may therefore go on with his sinful activities and at the same time chant the Hare Krsna mantra to neutralize them is the greatest offense at the lotus feet of hari-nama.
The eighth offense is stated thus: dharma-vrata-tyaga-hutadi-sarva-subha-kriya-samyam api pramadah. It is offensive to consider the chanting of the Hare Krsna mantra to be a religious ritualistic ceremony. Performing religious ceremonies, following vows and practicing renunciation and sacrifice are all materialistic auspicious activities. The chanting of the Hare Krsna maha-mantra must not be compared to such materialistic religiosity.This is an offense at the lotus feet of the Lord.
The ninth offense is described as follows:
 

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