Mahabharata 13.128.35
महेश्वर उवाच · maheśvara uvāca
रहस्यश्रवणं धर्मो वेदव्रतनिषेवणम्व्रतचर्यापरो धर्मो गुरुपादप्रसादनम्
rahasyaśravaṇaṃ dharmo vedavrataniṣevaṇamvratacaryāparo dharmo gurupādaprasādanam
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book