Mahabharata 5.91.15

ज्ञातीनां हि मिथो भेदे यन्मित्रं नाभिपद्यतेसर्वयत्नेन मध्यस्थं न तन्मित्रं विदुर्बुधाः

jñātīnāṃ hi mitho bhede yanmitraṃ nābhipadyatesarvayatnena madhyasthaṃ na tanmitraṃ vidurbudhāḥ

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