ya ete pitr-devanam
sastrena caksusa veda
jana-stho ’pi na muhyati
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Even though situated in a material body, one who is fully aware of the paths known as pitr-yana and deva-yana, and who thus opens his eyes in terms of Vedic knowledge, is never bewildered in this material world.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Acaryavan puruso 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-gita, acaryopasanam: one must approach the acarya for real knowledge. Tad-vijñanartham sa gurum evabhigacchet: one must approach the acarya, for then one will receive perfect knowledge. When guided by the spiritual master, one attains the ultimate goal of life.