Mahabharata 12.337.56

मया हि सुमहत्तप्तं तपः परमदारुणम्पुरा मतिमतां श्रेष्ठाः परमेण समाधिना

mayā hi sumahattaptaṃ tapaḥ paramadāruṇampurā matimatāṃ śreṣṭhāḥ parameṇa samādhinā

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