Sanskrit
असक्तबुद्धिः सर्वत्र जितात्मा विगतस्पृहः । नैष्कर्म्यसिद्धिं परमां संन्यासेनाधिगच्छति ॥ ४९ ॥
asakta-buddhiḥ sarvatra jitātmā vigata-spṛhaḥ naiṣkarmya-siddhiṃ paramāṃ sannyāsenādhigacchati
Translation
He whose Reason is everywhere unattached, the self-subdued, dead to desires, he goeth by renunciation to the supreme perfection of freedom from obligation.
Annie Besant · The Bhagavad-Gita, translated by Annie Besant (4th ed., 1922) — Wikisource · Public Domain
Explanation
The person of everywhere-unattached reason, self-mastered and free of longing, reaches naishkarmya-siddhi — perfection through freedom from the bondage of action — by way of sannyasa. This is the chapter finally settling the karma-yoga-versus-sannyasa tension running since chapter 3: renunciation here isn’t abstention from acting but the inward detachment that stops action from generating bondage in the first place, the same redefinition chapter 5 first proposed and chapter 6 developed through meditation.