Mahabharata 14.2.13

कर्मणा येन मुच्येयमस्मात्क्रूरादरिंदमकर्मणस्तद्विधत्स्वेह येन शुध्यति मे मनः

karmaṇā yena mucyeyamasmātkrūrādariṃdamakarmaṇastadvidhatsveha yena śudhyati me manaḥ

Our plain-language meaning of this verse is waiting for scholar review.