Bhagavad Gita 4.34

तद्विद्धि प्रणिपातेन परिप्रश्नेन सेवया ।
उपदेक्ष्यन्ति ते ज्ञानं ज्ञानिनस्तत्त्वदर्शिन:  ॥

tad-viddhi praṇipātena paripraśnena sevayā
upadekṣyanti te jñānaṃ jñāninas-tattva-darśina: – 4.34 

To gain that knowledge, go to the Knowers, who have the right vision of Truth; prostrate before them, inquire with humility, serve them fondly. They will instruct true knowledge to you.