Mahabharata 15.12.5

प्रयास्यमानो नृपतिस्त्रिविधं परिचिन्तयेत्आत्मनश्चैव शत्रोश्च शक्तिं शास्त्रविशारदः

prayāsyamāno nṛpatistrividhaṃ paricintayetātmanaścaiva śatrośca śaktiṃ śāstraviśāradaḥ

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