Whose understanding (buddhi) is unattached everywhere, whose self (ātman) is conquered, whose desire is gone, He attains the supreme perfection of actionlessness (naiṣkarmyasiddhi), through renunciation (sannyāsa).
His understanding everywhere detached, the self mastered, longing gone, one finds through renunciation the supreme success beyond action.
(49) With soul detached from everything, with self subdued, [all] longing gone, renounce; and so you will find complete success, perfection, works transcended.
18.49 He whose intellect remains unattached to everything, who has conquered his internal organs and is desireless, attains through monasticism the supreme perfection consisting in the state of one free from duties.
18.49 He whose understanding is on all sides unattached, whose self is conquered, who is free from desires --- he attains by renunciation the supreme perfection transcending all activity.
18.49 He whose intellect is unattached everywhere, who has subdued his self, from whom desire has fled, -- he by renunciation, attains the supreme state of freedom from action.