Śrīmad-Bhāgavatam · Text 2.9.31
Who is speaking and story frame
श्रीभगवानुवाच
ज्ञानं परमगुह्यं मे यद् विज्ञानसमन्वितम् ।
सरहस्यं तदङ्गं च गृहाण गदितं मया ॥ ३१ ॥
śrī-bhagavān uvāca
jñānaṁ parama-guhyaṁ me
yad vijñāna-samanvitam
sarahasyaṁ tad-aṅgaṁ ca
gṛhāṇa gaditaṁ mayā
The Personality of Godhead said: Knowledge about Me as described in the scriptures is very confidential, and it has to be realized in conjunction with devotional service. The necessary paraphernalia for that process is being explained by Me. You may take it up carefully.
Read Śrīla Prabhupāda's purport on Vedabase.io