Text Three
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utsāhāt —by enthusiasm;  niścayāt —by confidence;  dhairyāt —by patience;  tat-tat-karma —various activities favorable for devotional service;  pravartanāt —by performing;  saṅga-tyāgāt —by giving up the association of non-devotees;  sataḥ —of the great previous  ācāryas ;  vṛtteḥ —by following in the footsteps;  ṣaḍbhiḥ —by these six;  bhaktiḥ —devotional service;  prasidhyati —advances or becomes successful.
TRANSLATION
There are six principles favorable to the execution of pure devotional service: (1) being enthusiastic, (2) endeavoring with confidence, (3) being patient, (4) acting according to regulative principles [such as śravaṇam kīrtanam viṣṇoḥ smaraṇam—hearing, chanting and remembering Kṛṣṇa], (5) abandoning the association of nondevotees, and (6) following in the footsteps of the previous ācāryas. These six principles undoubtedly assure the complete success of pure devotional service.
PURPORT
Devotional service is not a matter of sentimental speculation or imaginative ecstasy. Its substance is practical activity. Śrīla Rūpa Gosvāmī, in his  Bhakti-rasāmṛta-sindhu  (1.1.11), has defined devotional service as follows:
anyābhilāṣitā-śūnyaṁ jñāna-karmādy-anāvṛtam ānukūlyena kṛṣṇānu- śīlanaṁ bhaktir uttamā