Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 56

Sanskrit:

य एते पितृदेवानामयने वेदनिर्मिते ।शास्त्रेण चक्षुषा वेद जनस्थोऽपि न मुह्यति ॥ ५६ ॥

ITRANS:

ya ete pitṛ-devānāmayane veda-nirmiteśāstreṇa cakṣuṣā vedajana-stho ’pi na muhyati

Translation:

Even though situated in a material body, one who is fully aware of the paths known as pitṛ-yāna and deva-yāna, and who thus opens his eyes in terms of Vedic knowledge, is never bewildered in this material world.

Purport:

Ācāryavān puruṣo veda: one who is guided by the bona fide spiritual master knows everything as stated in the Vedas, which set forth the standard of infallible knowledge. As recommended in Bhagavad-gītā, ācāryopāsanam: one must approach the ācārya for real knowledge. Tad-vijñānārthaṁ sa gurum evābhigacchet: one must approach the ācārya, for then one will receive perfect knowledge. When guided by the spiritual master, one attains the ultimate goal of life.