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utsāhān niścayād dhairyāt
tat-tat-karma-pravartanāt
saṅga-tyāgāt sato vṛtteḥ
ṣaḍbhir bhaktiḥ prasidhyati

“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 śravaṇaṁ kīrtanaṁ viṣṇoḥ smaraṇam [SB 7.5.23]—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.”

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 nondevotees;
sataḥ—of the great previous ācāryas;
vṛtteḥ—by following in the footsteps;
ṣaḍbhiḥ—by these six;
bhaktiḥ—devotional service;
prasidhyati—advances or becomes successful.

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[05. Other Books by Śrīla Prabhupāda / The Nectar of Instruction, "Upadeśāmṛta" / NoI: verse 3 / TEXT / utsāhān niścayād dhairyāt]