So to understand this knowledge one has to approach ācārya. Ācārya means one who knows the purpose of Vedic literature, śāstra. Āśṛṇoti yaḥ śāstram. And practices and teaches his disciple. He knows. Ācārya means knows. One who knows the purpose of Vedic literature, he practices in his life, and he teaches his disciple. He is called ācārya. So ācārya upāsanam. Before worshiping the Lord... Just like here Kṛṣṇa said in the beginning, ācāryopāsanam, and in the middle he says, mayi cānanya-yogena bhaktir avyabhicāriṇī. So before engaging yourself in devotional service to the Lord, you must first of all worship ācārya, ācāryopāsanam. One cannot become a devotee personally. Just like some rascals say, "What is the use of accepting guru?" Of course, they have got very bad experience.
But who is ācārya? Ācārya means one who has received the Vedic knowledge through the paramparā system. Evaṁ paramparā-prāptam imaṁ rājarṣayo viduḥ (BG 4.2). He is ācārya. Ācārya cannot be manufactured, self-made. No. He must come down from the disciplic succession. He is ācārya. You have to approach such ācārya who is coming in disciplic succession. ācāryavan puruṣo veda. One who is under the shelter of ācārya, he knows things. So Kṛṣṇa recommends also here that if you actually want to become in knowledge, if you want to have real knowledge, then you must worship ācārya. Ācāryopāsanam. This is Vedic system. Tad vijñānārthaṁ sa gurum evābhigacchet (MU 1.2.12).