Patanjali Yoga Sutra 2.43

Sanskrit Sutra

कायेन्द्रियसिद्धिरशुद्धिक्षयात्तपसः॥४३॥

Swami Vivekananda's translation

The result of mortification is bringing powers to the organs and body, by destroying the impurity.

Chapter link: Yoga Sutra Chapter 2