The transcendentalists can be categorized into six basic types: the neophyte transcendentalist, the absorbed transcendentalist, one who is actually situated in transcendence, one who actually desires liberation, one who is actually liberated, and one who is actually engaged in activities in his constitutional position. All of these are called ātmārāma. When a person becomes ātmārāma, or a great thinker in Kṛṣṇa consciousness, he fully engages in devotional service. According to the grammatical rules, there are many ātmārāmas, but one sense of the word is sufficient to represent the others. In the collective sense, all the ātmārāmas are inclined to worship the Supreme Lord Kṛṣṇa.
The mystic who worships the Supersoul within himself is also called ātmārāma. The ātmārāma yogīs are of two kinds: sagarbha and nigarbha, It is stated in Śrīmad-Bhāgavatam (2.2.8): "Some yogīs meditate within their heart on the localized Viṣṇu, who is four-handed and who holds four symbols: conch, disc, mace and lotus." The yogī who thinks of the four-handed Viṣṇu becomes absorbed in devotional ecstasy and evinces the symptoms of that state. Sometimes he cries, and sometimes he feels separation. In this way he merges in transcendental bliss. The result of all this is that he becomes entrapped like a fish.
The sagarbha and nigarbha yogīs can be further divided into three categories: the beginner, the ascendent, and he who has already attained perfection. These yogīs are described in the Sixth Chapter of Bhagavad-gītā. Those who are trying to ascend on the path of mystic yoga are called ārurukṣu. In ārurukṣu yoga, various sitting postures are practiced, and the mind is concentrated. But when one has already ascended to the path of yoga, meditation and detachment are the goals, and when one is no longer attached to working for sense gratification, he gradually becomes free. At that time he also attains a state of ecstasy called yoga ārūḍha. If these mystic yogīs somehow or other come in contact with a saintly person, they become devotees of Kṛṣṇa. The word urukrama indicates the Supreme Lord. All the ātmārāmas are engaged in devotional service to Urukrama. Before engaging in devotional service, such transcendentalists are called śāntas, or pacified devotees. The word ātmā, or self, is sometimes translated as "mind." Sometimes mental speculators present philosophical theories in different ways, but when they come in contact with saintly persons engaged in devotional service, they also become devotees.
Śrīmad-Bhāgavatam (10.87.18) describes the two classes of yogīs (sagarbha and nigarbha) as follows: "The yogīs begin their practice of yoga by worshiping the abdomen, and they try to concentrate their attention on their intestines. Gradually their meditation rises to the heart and concentrates on the mind and the heart. Then their attention rises to the top of the head, and one who can rise to that position is understood to have become perfect and to be no longer subjected to birth and death." Even if such yogīs come in contact with pure devotees, they also render causeless devotional service to the Lord.
The word ātmā also means "to endeavor." In every practice there is some endeavor, and the ultimate endeavor is the endeavor to reach the highest perfectional stage of devotional service. In Śrīmad-Bhāgavatam (1.5.18) it is stated that one should try to attain the highest goal, which cannot be attained either in the higher or lower planetary systems. The idea is that material happiness and misery are available in all planetary systems in the course of time, but the highest achievement, devotional service, cannot be attained anywhere without endeavor. Therefore in the Bṛhan-nāradīya Purāṇa it is said that one who is serious about understanding the highest perfectional stage of devotional service can become successful in everything simply by his endeavor. One cannot attain the highest perfectional stage of devotional service without personal endeavor.