Mahabharata 12.259.9

तत्त्वाभेदेन यच्छास्त्रं तत्कार्यं नान्यथा वधःअसमीक्ष्यैव कर्माणि नीतिशास्त्रं यथाविधि

tattvābhedena yacchāstraṃ tatkāryaṃ nānyathā vadhaḥasamīkṣyaiva karmāṇi nītiśāstraṃ yathāvidhi

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