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.

kāya - the bodyindriya - faculty of sense; sense; organ of sense; organs of motor action and sensory perceptionsiddhi - accomplishment, performance, fulfilment, attainment, success; the hitting of a mark; coming into force, validity; any unusual skill or faculty or capability; the acquisition of supernatural powers by magical means or the faculty so acquiredaśuddhi - impuritykṣaya - diminish, wasting or wearing awaytapas - to heat; religious austerity; self-discipline; pain, suffering
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Commentaries and Reflections

Commentary by T Krishnamacharya:

Tapas
– Good, limited food
– The ability to listen
– Sharpening the senses
– Building resistance to Dvaṃdva

Commentary by TKV Desikachar:

“The Siddhi depends on the Bhāvanam.”