Bhagavad Gita 18.52
Enjoying solitude, being abstemious, having his body, mind, and speech under perfect control, and being absorbed in meditation, he becomes free—always filled with the spirit of renunciation.
विविक्तसेवी लघ्वाशी यतवाक्कायमानसः।ध्यानयोगपरो नित्यं वैराग्यं समुपाश्रितः॥viviktasevī laghvāśī yatavākkāyamānasaḥ|dhyānayogaparo nityaṃ vairāgyaṃ samupāśritaḥ||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).