“The ten processes for liberation or improvement on the path of liberation are not meant for the devotees. Kevalaya bhaktya: if one simply engages in devotional service to the Lord, all ten methods of liberation are automatically observed. Prahlada Maharaja’s proposal is that such processes may be recommended for the ajitendriya, those who cannot conquer their senses. Devotees, however, have already conquered their senses. Sarvopadhi-vinirmuktam tat-paratvena nirmalam: a devotee is already freed from material contamination. Srila Bhaktisiddhanta Sarasvati Thakura therefore said:
dusta mana! tumi kisera vaisnava?
pratisthara tare, nirjanera ghare,
tava hari-nama kevala kaitava
There are many who like to chant the Hare Krishna mantra in a silent, solitary place, but if one is not interested in preaching, talking constantly to the nondevotees, the influence of the modes of nature is very difficult to surpass. Therefore unless one is extremely advanced in Krishna consciousness, one should not imitate Haridasa Thakura, who had no other business than chanting the holy name always, twenty-four hours a day. Prahlada Maharaja does not condemn such a process; he accepts it, but without active service to the Lord, simply by such methods one generally cannot attain liberation. One cannot attain liberation simply by false pride. ”
Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Seventh Canto, Chapter 09 – Text 46