As soon as one is very intimately connected with the Supreme Personality of Godhead, one surely becomes free from all material contamination. Yā nirvṛtis tanu-bhṛtām. This cessation of all material happiness is called nirvṛti or nirvāṇa. Śrīla Rūpa Gosvāmī says in Bhakti-rasāmṛta-sindhu (1.1.38):
brahmānando bhaved eṣa
cet parārdha-guṇī-kṛtaḥ
naiti bhakti-sukhāmbhodheḥ
paramāṇu-tulām api
"If brahmānanda, the bliss of merging in the Brahman effulgence, were multiplied one hundred trillion times, it would still not equal even an atomic fragment of the ocean of transcendental bliss felt in devotional service."

(Srimad Bhagavatam-----7:7:37-----purport).

The words dhīrāḥ sarva-bhāvena do not mean "in whichever way you like." Bhāva is the preliminary condition of love of Godhead.
athāsaktis tato bhāvas
tataḥ premābhyudañcati
sādhakānām ayaṁ premṇaḥ
prādurbhāve bhavet kramaḥ
(Bhakti-rasāmṛta-sindhu 1.4.16)
The bhāva stage is the final division before one reaches love of Godhead. The word sarva-bhāva means that one can love the Supreme Personality of Godhead in different transcendental modes of mellows, beginning with dāsya, sakhya, vātsalya and mādhurya. In the śānta stage, one is on the border of loving service to the Lord. Pure love of Godhead begins from dāsya and develops to sakhya, vātsalya and then mādhurya. Still, in any of these five mellows one can render loving service to the Supreme Lord. Since our main business is to love the Supreme Personality of Godhead, one can render service from any of the above-mentioned platforms of love.

(Srimad Bhagavatam-----7:9:54-----purport).

Material achievements are not the ultimate goal of devotional service. The ultimate goal of devotional service is love of Godhead. Therefore although Prahlāda Mahārāja, Dhruva Mahārāja, Ambarīṣa Mahārāja, Yudhiṣṭhira Mahārāja and many devotee kings were materially very opulent, they accepted their material opulence in the service of the Lord, not for their personal sense gratification. Of course, possessing material opulence is always fearful because under the influence of material opulence one may be misdirected from devotional service. Nonetheless, a pure devotee (anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11)) is never misdirected by material opulence. On the contrary, whatever he possesses he engages one hundred percent in the service of the Lord. When one is allured by material possessions, they are considered to be given by māyā, but when one uses material possessions fully for service, they are considered God's gifts, or facilities offered by Kṛṣṇa for enhancing one's devotional service.

(Srimad Bhagavatam-----7:10:1-----purport).

He therefore took shelter of the lotus feet of Lord Nṛsiṁha-deva, and not the feet of any demigod. It is to be understood that if one really wants release from this material world, from the threefold miseries and from janma-mṛtyu jarā-vyādhi (B.G.13:9) (birth, death, old age and disease), one must take shelter of the Supreme Personality of Godhead, for without the Supreme Personality of Godhead one cannot get release from materialistic life. Atheistic men are very much attached to material enjoyment. Therefore if they get some opportunity to achieve more and more material enjoyment, they take it. Prahlāda Mahārāja, however, was very careful in this regard. Although born of a materialistic father, because he was a devotee he had no material desires (anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11)).

(Srimad Bhagavatam-----7:10:2-----purport).

Bhakti-rasāmṛta-sindhu has given considerable discussion about nitya-siddha and sādhana-siddha devotees. Nitya-siddha devotees come from Vaikuṇṭha to this material world to teach, by their personal example, how to become a devotee. The living entities in this material world can take lessons from such nitya-siddha devotees and thus become inclined to return home, back to Godhead. A nitya-siddha devotee comes from Vaikuṇṭha upon the order of the Supreme Personality of Godhead and shows by his example how to become a pure devotee (anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11)). In spite of coming to this material world, the nitya-siddha devotee is never attracted by the allurements of material enjoyment. A perfect example is Prahlāda Mahārāja, who was a nitya-siddha, a mahā-bhāgavata devotee.

(Srimad Bhagavatam-----7:10:3-----purport).

They have been described as sukṛtī, pious, because in their distress or need for money they have approached the Supreme Lord. Unless one is pious, one cannot approach the Supreme Personality of Godhead. However, although a pious man may receive some material benefit, one who is concerned with material benefits cannot be a pure devotee. When a pure devotee receives material opulences, this is not because of his pious activity but for the service of the Lord. When one engages in devotional service, one is automatically pious. Therefore, a pure devotee is anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11). He has no desire for material profit, nor does the Lord induce him to try to profit materially. When a devotee needs something, the Supreme Personality of Godhead supplies it (yoga-kṣemaṁ vahāmy aham (B.G.9:22).

(Srimad Bhagavatam-----7:10:4-----purport).

The only remedy is to take to devotional service, which begins when one is free from all material desires. Anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11). Anya-abhilāṣitā means "material desire," and śūnyam means "free from." The spiritual soul has spiritual activities and spiritual desires, as described by Śrī Caitanya Mahāprabhu: mama janmani janmanīśvare bhavatād bhaktir ahaitukī tvayi (Cc. Antya 20.29, Śikṣāṣṭaka 4). Unalloyed devotion to the service of the Lord is the only spiritual desire. To fulfill this spiritual desire, however, one must be free from all material desires. Desirelessness means freedom from material desires. This is described by Śrīla Rūpa Gosvāmī as Anyābhilāṣitā-śūnyam (Bhakti-rasāmṛta-sindhu 1.1.11). As soon as one has material desires, one loses his spiritual identity. Then all the paraphernalia of one's life, including one's senses, body, religion, patience and intelligence, are deviated from one's original Kṛṣṇa consciousness.

(Srimad Bhagavatam-----7:10:8-----purport).

This is the way of expert management of material life. Because a devotee knows how to manage expertly, he is called jīvan-mukta. As Rūpa Gosvāmī explains in Bhakti-rasāmṛta-sindhu:
īhā yasya harer dāsye
karmaṇā manasā girā
nikhilāsv apy avasthāsu
jīvan-muktaḥ sa ucyate
"A person acting in Kṛṣṇa consciousness (or, in other words, in the service of Kṛṣṇa) with his body, mind, intelligence and words is a liberated person even within this material world, although he may be engaged in many so-called material activities." Because of constantly engaging in devotional service, in any condition of life, a devotee is free from all material bondage.

(Srimad Bhagavatam-----7:10:14-----purport).

One should learn human behavior from śruti, the Vedas, and from smṛti, the scriptures following the Vedic principles. Śrīla Rūpa Gosvāmī in his Bhakti-rasāmṛta-sindhu says:
śruti-smṛti-purāṇādi-
pañcarātra-vidhiṁ vinā
aikāntikī harer bhaktir
utpātāyaiva kalpate
(Brs. 1.2.101)
The purport is that to become a devotee one must follow the principles laid down in śruti and smṛti. One must follow the codes of the purāṇas and the pāñcarātrikī-vidhi. One cannot be a pure devotee without following the śruti and smṛti, and the śruti and smṛti without devotional service cannot lead one to the perfection of life.

(Srimad Bhagavatam-----7:10:7-----purport).