Nārāyaṇa, the Supreme Personality of Godhead, the well-wisher and friend of all living entities, formerly explained this transcendental knowledge to the great saint Nārada. Such knowledge is extremely difficult to understand without the mercy of a saintly person like Nārada, but everyone who has taken shelter of Nārada’s disciplic succession can understand this confidential knowledge.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ज्ञानं तदेतदमलं दुरवापमाह नारायणो नरसखः किल नारदाय । एकान्तिनां भगवतस्तदकिञ्चनानां पादारविन्दरजसाऽऽप्लुतदेहिनां स्यात्
jñānaṃ tadetadamalaṃ duravāpamāha nārāyaṇo narasakhaḥ kila nāradāya | ekāntināṃ bhagavatastadakiñcanānāṃ pādāravindarajasā''plutadehināṃ syāt
SB 7.6.27