यथा सिद्धरसस्पर्शात्ताम्रं भवति काञ्चनम् ।
सन्निधानाद्गुरोरेवं शिष्यो विष्णुमयो भवेत् ॥
yathā siddha-rasa-sparśāt tāmraṁ bhavati kāñcanam |
sannidhānād guror evaṁ śiṣyo viṣṇumayo bhavet ||
(Āgama-śāstra; cited in Bhakti Sandarbha: 237)
“As copper turns into gold at the touch of quicksilver, so a disciple becomes absorbed in [devotion to] Viṣṇu as a result of being in the company of guru.”