The Vedanta Sutras of Badarayana, Commentary by Sankara (SBE38), tr. by George Thibaut [1896] at sacred-texts.com

9. And for this very same reason (the released soul is) without another lord.

For this very same reason, i.e. owing to the fact of the will of the released person not being barren, he who knows has no other lord over himself. For not even an ordinary person when forming wishes will, if he can help it, wish himself to be subject to another master. And scripture also declares this when saying, 'Those who depart from hence, after having discovered the Self and those true desires, for them there is freedom in all worlds' (Kh. Up. VIII, 1, 6).