Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 3
Sanskrit:
शृणुष्वावहितो राजन्नपि गुह्यं वदामि ते ।ब्रूयु: स्निग्धस्य शिष्यस्य गुरवो गुह्यमप्युत ॥ ३ ॥
ITRANS:
śṛṇuṣvāvahito rājannapi guhyaṁ vadāmi tebrūyuḥ snigdhasya śiṣyasyaguravo guhyam apy uta
Translation:
O King, kindly hear me with great attention. Although the activities of the Supreme Lord are very confidential, no ordinary man being able to understand them, I shall speak about them to you, for spiritual masters explain to a submissive disciple even subject matters that are very confidential and difficult to understand.