Bhagwad Gita
Chapter 6, Verse 18
यदा विनियतं चित्तमात्मन्येवावतिष्ठते।
निःस्पृहः सर्वकामेभ्यो युक्त इत्युच्यते तदा।।6.18।।
When the yogi, by practice of yoga, disciplines his mental activities and becomes situated in Transcendence—devoid of all material desires—he is said to have attained yoga.