Mahabharata 5.81.48
विदुरं च महाप्राज्ञं कुरूणां मन्त्रधारिणम्अगाधबुद्धिं धर्मज्ञं स्वजेथा मधुसूदन
viduraṃ ca mahāprājñaṃ kurūṇāṃ mantradhāriṇamagādhabuddhiṃ dharmajñaṃ svajethā madhusūdana
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book