BG 18.49-51
He whose Reason is everywhere unattached, the self-subdued, dead to desires, he goeth by renunciation to the supreme perfection of freedom from obligation. How he who hath attained perfection obtaineth the Eternal, that highest state of wisdom, learn thou from Me only succinctly, O Kaunteya. United to this Reason, purified, controlling the self by firmness, having abandoned sound and the other objects of the senses, having laid aside passion and malice,