Śrīmad-Bhāgavatam · Text 11.22.10
Who is speaking and story frame
अनाद्यविद्यायुक्तस्य पुरुषस्यात्मवेदनम् ।
स्वतो न सम्भवादन्यस्तत्त्वज्ञो ज्ञानदो भवेत् ॥ १० ॥
anādy-avidyā-yuktasya
puruṣasyātma-vedanam
svato na sambhavād anyas
tattva-jño jñāna-do bhavet
Because a person who has been covered by ignorance since time immemorial is not capable of effecting his own self-realization, there must be some other personality who is in factual knowledge of the Absolute Truth and can impart this knowledge to him.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.