Srila Bhaktisiddhanta Sarasvati Thakura has commented:

"In the neophyte stage one should always engage in hearing krsna-katha. This is called sravana-dasa, the stage of hearing. By constantly hearing the transcendental holy name of Krsna and hearing of His transcendental form, qualities and pastimes, one can attain to the stage of acceptance called varana-dasa. When one attains this stage, he becomes attached to the hearing of krsna-katha. When one is able to chant in ecstasy, he attains the stage of smaranavastha, the stage of remembering. Recollection, absorption, meditation, constant remembrance and trance are the five items of progressive krsna-smarana. At first, remembrance of Krsna may be interrupted at intervals, but later remembrance proceeds uninterrupted. When remembrance is uninterrupted, it becomes concentrated and is called meditation. When meditation expands and becomes constant, it is called anusmrti. By uninterrupted and unceasing anusmrti one enters the stage of samadhi, or spiritual trance. After smarana-dasa or samadhi has fully developed, the soul comes to understand his original constitutional position. At that time he can perfectly and clearly understand his eternal relationship with Krsna. That is called sampatti-dasa, the perfection of life."

(From Srila Prabhupada's purport to Nectar of Instruction verse 8)