One verse

Srimad Bhagavatam 11.22.10

11.22.10

अनाद्यविद्यायुक्तस्य पुरुषस्यात्मवेदनम् । स्वतो न सम्भवादन्यस्तत्त्वज्ञो ज्ञानदो भवेत् ॥ १० ॥

anādy-avidyā-yuktasya puruṣasyātma-vedanam svato na sambhavād anyas tattva-jño jñāna-do bhavet

anādi
without beginning
avidyā
with ignorance
yuktasya
who is joined
puruṣasya
of a person
ātma-vedanam
the process of self-realization
svataḥ
by his own ability
na sambhavāt
because it cannot occur
anyaḥ
another person
tattva-jñaḥ
the knower of transcendental reality
jñāna-daḥ
the bestower of real knowledge
bhavet
must be

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.