Śrīmad-Bhāgavatam · Text 11.20.4
Who is speaking and story frame
पितृदेवमनुष्याणां वेदश्चक्षुस्तवेश्वर ।
श्रेयस्त्वनुपलब्धेऽर्थे साध्यसाधनयोरपि ॥ ४ ॥
pitṛ-deva-manuṣyānāṁ
vedaś cakṣus taveśvara
śreyas tv anupalabdhe ’rthe
sādhya-sādhanayor api
My dear Lord, to understand those things beyond direct experience — such as spiritual liberation or the attainment of heaven and similar material enjoyments — and in general to understand the means and end of all things, it is imperative that the forefathers, demigods and human beings consult the Vedic literatures, for these literatures, being Your own laws, constitute the highest evidence and revelation.
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.