Bhagavad Gita Chapter 18, Verse 51
बुद्ध्या विशुद्धया युक्तो धृत्यात्मानं नियम्य च | शब्दादीन्विषयांस्त्यक्त्वा रागद्वेषौ व्युदस्य च ||
buddhyā viśuddhayā yukto dhṛtyātmānaṁ niyamya ca śabdādīn viṣayāṁs tyaktvā rāga-dveṣau vyudasya ca
United with purified intellect, having controlled the self with firmness, having abandoned sound and other sense objects, and having abandoned attachment and aversion.
Krishna begins to explain how to transcend the gunas. 'Buddhyā viśuddhayā yukto dhṛtyātmānaṁ niyamya ca'—united (yuktaḥ) with purified intellect (buddhyā viśuddhayā), having controlled (niyamya) the self (ātmānam) with firmness (dhṛtyā). 'Śabdādīn viṣayāṁs tyaktvā rāga-dveṣau vyudasya ca'—having abandoned (tyaktvā) sound and other sense objects (śabdādīn viṣayān), and having abandoned (vyudasya) attachment and aversion (rāga-dveṣau). This is the first part of the method: purify your intellect, control your self with firmness, abandon sense objects, and abandon attachment and aversion. This sets up the complete teaching about how to transcend the gunas. The verse continues in the next verse to show the result of this practice.