Bhagavad Gita 18.51

Guided always by pure reason, bravely restraining himself, renouncing the objects of sense and giving up attachment and hatred; he attains peace.

बुद्ध्या विशुद्धया युक्तो धृत्याऽऽत्मानं नियम्य च।शब्दादीन् विषयांस्त्यक्त्वा रागद्वेषौ व्युदस्य च॥

buddhyā viśuddhayā yukto dhṛtyā''tmānaṃ niyamya ca|śabdādīn viṣayāṃstyaktvā rāgadveṣau vyudasya ca||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).