तेषु यथास्वबलवृद्धिकरं कर्म प्रयुञ्जीत ॥ कZ_०९.१.२० ॥
teṣu yathāsvabalavṛddhikaraṃ karma prayuñjīta
Among these factors, he should undertake the operation which, in the given case, best increases his own strength.
Choose the action that most increases one’s own strength in the specific context.
Primarily effectiveness: it frames policy selection as strength-augmentation under given conditions.