II, 3, 39

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

39. And on account of the impossibility of meditation (samâdhi).

Moreover the meditation taught in the Vedânta-texts, whose aim is the realisation of the Self as represented by the Upanishads, is possible only if the Self is the agent ². Compare the following passages, 'Verily, the Self is to be seen, to be heard, to be perceived, to be marked' (Bri. Up. II, 4, 5); 'The Self we must seek out, we must try to understand' (Kh. Up. VIII, 7, 1); 'Meditate on the Self as Om' (Mu. Up. II, 2, 6).--Therefrom also it follows that the Self is an agent.

Footnotes

52:2 The Self which enjoys the fruit of final release must be the agent in the meditation which is instrumental in bringing about final release.