yaḥ kenāpy atibhāgyena jāta-śraddho’sya sevane
yaḥ kenāpy atibhāgyena jāta-śraddho’sya sevane |
nātisakto na vairāgya-bhāg asyām adhikāry asau ||
(Bhakti-rasāmṛta-sindhu: 1.2.14)
“One who by some sort of great fortune is possessed of śraddhā in his [i.e., Śrī Kṛṣṇa’s] service and is neither excessively attached nor possessed of non-attachment is a bearer of eligibility (adhikārī) for this [i.e., for vaidhī-bhakti].”