Yoga Sūtra Chapter Two verse 43
कायेन्द्रियसिद्धिरशुद्धिक्षयात् तपसः ॥४३॥
kāya-indriya-siddhiḥ aśuddhi-kṣayāt-tapasaḥ ||43||
From self-discipline, impurities diminish
and accomplishment in the body and senses.
Commentaries and Reflections
Commentary by T Krishnamacharya:
Tapas
– Good, limited food
– The ability to listen
– Sharpening the senses
– Building resistance to Dvaṃdva