NITyaananda Gauraanga Hare Krishna NAAma BhaktI (NITAAI) Yoga

SB 11.2.47 purport:

Srila Bhaktisiddhanta Sarasvati Thakura has given a nice explanation of the difference between arcana and bhajana. Arcana refers to the platform of sadhana-bhakti, in which one serves the Lord to carry out the rules and regulations of the process. One who has achieved the shelter of the Lord's holy name and is totally engaged in the attempt to serve the Lord should be considered to be on the platform of bhajana, even though his external activities may sometimes be less strict than those of the neophyte engaged in arcana. This apparent lack of strictness, however, refers to laxity not in the basic principles of sane behavior and renunciation of sense gratification, but rather in the details of Vaisnava ceremonies.