As they were leaving, those bhakti-vedāntas, who are very kind to poor-hearted souls, instructed me in that most confidential subject which is instructed by the Personality of Godhead Himself.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ज्ञानं गुह्यतमं यत्तत्साक्षाद्भगवतोदितम् । अन्ववोचन् गमिष्यन्तः कृपया दीनवत्सलाः
jñānaṃ guhyatamaṃ yattatsākṣādbhagavatoditam | anvavocan gamiṣyantaḥ kṛpayā dīnavatsalāḥ
SB 1.5.30