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MM mantra 48

dhyāyanti ye viṣṇum anantam avyayaṁ
hṛt-padma-madhye satataṁ vyavasthitam
samāhitānāṁ satatābhaya-pradaṁ
te yānti siddhiṁ paramāṁ tu vaiṣṇavīm
Synonyms: 
dhyāyanti — meditate; ye — who; viṣṇum — on Lord Viṣṇu; anantam — the unlimited; avyayam — the infallible; hṛt — of the heart; padma — the lotus; madhye — within; satatam — always; vyavasthitam — situated; samāhitānām — for those who are fixed in awareness of Him; satata — perpetual; abhaya — fearlessness; pradam — granting; te — they; yānti — attain; siddhim — perfection; paramām — supreme; tu — indeed; vaiṣṇavīm — of the Vaiṣṇavas, and in relation to Viṣṇu.
Translation: 
The unlimited and infallible Viṣṇu, who is always present within the lotus of the heart, grants fearlessness to those who fix their intelligence upon Him. The devotees who meditate on Him will reach the supreme perfection of the Vaiṣṇavas.
Purport: 

King Kulaśekhara has previously spoken of perfections we can attain by using our mind and senses in the service of the Supreme Lord. Now he specifies that the ultimate perfection is siddhiṁ vaiṣṇavīm, the supreme perfection of the Vaiṣṇavas.

All Vaiṣṇavas are rightly situated, but even among devotees there are progressive states. In The Nectar of Devotion, Śrīla Prabhupāda summarizes the characteristics of three classes of devotees. We paraphrase his summary as follows: The third-class devotee is one whose faith is not strong and who, at the same time, does not recognize the decision of the revealed scriptures. The second-class devotee may not be expert in arguing on the basis of scripture, but he has firm faith in the objective. And the first-class devotee is one who is very expert in the study and explanation of the scriptures and at the same time has strong faith.

For the most part, the third-class devotee (known as kaniṣṭha-adhikārī) has faith in the Deity in the temple and worships the Lord there. But the kaniṣṭha-adhikārī is usually unable to appreciate other devotees or the presence of the Lord in everyone's heart. Nevertheless, even the third-class Vaiṣṇava is considered highly elevated. Śrīla Prabhupāda writes, "Even the third-class devotee—who is not advanced in knowledge of the Absolute Truth but simply offers obeisances with great devotion, thinks of the Lord, sees the Lord in the temple, and brings flowers and fruit to offer to the Deity—becomes imperceptibly liberated" (SB 3.25.36, purport). By dint of his attraction to the Deities of Śrī Śrī Rādhā-Kṛṣṇa or Lakṣmī-Nārāyaṇa, the kaniṣṭha-adhikārī is in a transcendental position, above those who are trying for liberation by speculation or other methods.

One advances through the stages of perfection by applying oneself under the direction of the guru—and everything depends on one's faith. In the Caitanya-caritāmṛta (Madhya 22.64), Lord Caitanya confirms this, explaining to Sanātana Gosvāmī that one becomes qualified as a devotee on the elementary platform, the intermediate platform, and the highest platform of devotional service according to the development of one's śraddhā (faith).

One does not advance in devotional service as one does in the material world, by climbing up a social ladder or by working hard for economic development or by military strength. Rather, one has to give up all material "strengths" and designations and become as humble as a blade of grass. The basis of devotional service is chanting of the holy name, and according to Lord Caitanya one cannot chant constantly unless one offers all respects to others without expecting respect for oneself. Instead of trying to push oneself ahead while maintaining the contaminations of lust, anger, and greed in the heart, one has to become pure and realize oneself as the servant of God, His devotees, and all living beings.

The perfect stage of devotion is described in Text 25 of the Mukunda-mālā-stotra: "O enemy of Madhu and Kaiṭabha, O Lord of the universe, the perfection of my life and the most cherished mercy You could show me would be for You to consider me the servant of the servant of the servant of the servant of the servant of the servant of Your servant." Lord Caitanya also expressed this important sentiment when He declared that He was not a brāhmaṇa or a sannyāsī but a servant of the servant of the servant of the lotus feet of Kṛṣṇa, the Lord of the gopīs of Vṛndāvana [Cc. Madhya 13.80]. Thus devotees who want to attain devotional perfections will pray for the good fortune to serve recognized Vaiṣṇavas.

King Kulaśekhara also gives us the vision of constant meditation on Lord Viṣṇu. This can be attained by engaging oneself twenty-four hours a day in various services within the framework of the ninefold practices of bhakti (see Śrīmad-Bhāgavatam 7.5.24). A true Vaiṣṇava never thinks he has attained the ultimate state of perfection, but rather continues to serve the Lord and the devotees while always remaining conscious of the Supreme Lord in his heart.