https://youtu.be/kSDyLW-rCRY This is a talk in Tamil by Sri Mani Dravid Sastrigal on 'Sadhana Panchakam / Upadesha Panchakam' of Shankaracharya. After his talk MM Sri Krishnamurthi Sastrigal shares his experiences with the Late MM Sri S.R.Krishnamurthy Sastrigal who had taught both the speakers.