Mahabharata 5.41.5

विदुर उवाच · vidura uvāca

शूद्रयोनावहं जातो नातोऽन्यद्वक्तुमुत्सहेकुमारस्य तु या बुद्धिर्वेद तां शाश्वतीमहम्

śūdrayonāvahaṃ jāto nāto'nyadvaktumutsahekumārasya tu yā buddhirveda tāṃ śāśvatīmaham

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