Mahabharata 3.149.41

राज्ञामुपायाश्चत्वारो बुद्धिमन्त्रः पराक्रमःनिग्रहानुग्रहौ चैव दाक्ष्यं तत्कार्यसाधनम्

rājñāmupāyāścatvāro buddhimantraḥ parākramaḥnigrahānugrahau caiva dākṣyaṃ tatkāryasādhanam

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