Ramana MaharshiWhatever thing [in body and mind] acts in whatever way, remain aloof from those activities [that is, from the notion that it is ‘I’ who acts] and simply be a witness to them.

Ramana Maharshi

Brahma Sūtras Reference Materials:

Video/Audio Lectures

Swami Paramarthananda
390 classes (~55 mins each)

Swami Dayananda Saraswati
99 classes (~60 mins each)

Swami Tattvavidananda
14 classes (search for "Adhyasa Bhasyam" on the linked page)

Swami Viditatmananda
99 classes on First Four Sutras (~90 mins each)

002 Brahma sūtra Chathsutri

Swami Paramananda Bharti
7 classes on Adhyasa Bhashya or Shankaracharya's Intro (~60-90 mins each)

Adhyasa Bhashyam 6