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Teachings of Lord Chaitanya
There is a nice verse in the  Skanda Purana  which says: "My dear Devarsi (Narada), you are glorious, and by your mercy even the lowest creature, such as a hunter, also became elevated to such a state of devotion, and attained transcendental attachment for Krishna."
Narada then enquired of the hunter-devotee: "Are you getting your foodstuff regularly?"
The hunter replied, "You send so many people, and they bring so much eatables that we both cannot eat so much."
Narada replied, "That's all right. Whatever you are getting, it is all right. Now continue your devotional service in that way." And after saying that, both Narada and Parbut Muni disappeared from that place.
This recitation of the story of the hunter is offered by Lord Chaitanya to show that even a hunter can be engaged in the devotional service of Krishna by the influence of pure devotees.
He then said that another meaning of  Atma  is: all varieties of the Personality of Godhead. Generally, the Personality of Godhead Himself, Krishna, and His different expansions, are all known as the Personality of Godhead. So anyone who is engaged in the devotional service of any Form or extension of the Supreme Personality of Godhead is also called  Atmarama , and all such devotees engage themselves either in the regulative principles of devotional service, or in devotional service in transcendental love.
These two kinds of devotees also are divided into three categories: the associates, those in the perfection of devotional service, and those newly-engaged in devotional service. Newly engaged devotees can be divided into two: ones who have already attained an attachment for the Lord, and others who have not attained such attachment for the Lord. And, according to the two divisions of devotional service, namely the regulative principles and attachment by transcendental love, all these four classes of devotees become eight in number. By following the regulative principles of devotion, the perfect associates of the Lord are divided further into four classes: the servants, the friends, the parental superiors, and the fiancees.
Just as devotees are sometimes perfected by devotional service, so some of them are eternally perfect. In the regulative principle of devotional service, according to the advanced standard and the beginner's standard, there are sixteen kinds of devotees in transcendental loving service of the Lord. Therefore, such  Atmaramas  can be considered to exist in 32 divisions. If you apply the words  Muni ,  Nirgrantha ,  Cha  and  Api  in the 32 classes, then it becomes a description of 58 different types of devotees. All these devotees can be sheltered