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kāya-indriya-siddhiḥ aśuddhi-kṣayāt-tapasaḥ
कायेन्द्रियसिद्धिरशुद्धिक्षयात् तपसः
From self-discipline, impurities diminish and accomplishment in the body and senses
kāya - the body
indriya - faculty of sense; sense; organ of sense
siddhi - accomplishment, performance, fulfilment, attainment, success
aśuddhi - impurity
kṣaya - diminish, wasting or wearing away
tapas - to heat; religious austerity; self-discipline; pain, suffering
Commentary by T Krishnamacharya:
Tapas
– Good, limited food
– The ability to listen
– Sharpening the senses
– Building resistance to Dvaṃdva