Mahabharata 12.220.14

दैत्य न व्यथसे शौर्यादथ वा वृद्धसेवयातपसा भावितत्वाद्वा सर्वथैतत्सुदुष्करम्

daitya na vyathase śauryādatha vā vṛddhasevayātapasā bhāvitatvādvā sarvathaitatsuduṣkaram

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