Mahabharata 14.15.24

धर्मपुत्रे हि धर्मज्ञे कृतज्ञे सत्यवादिनिसत्यं धर्मो मतिश्चाग्र्या स्थितिश्च सततं स्थिरा

dharmaputre hi dharmajñe kṛtajñe satyavādinisatyaṃ dharmo matiścāgryā sthitiśca satataṃ sthirā

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