Mahabharata 12.327.21

मया हि सुमहत्तप्तं तपः परमदारुणम्भूतं भव्यं भविष्यच्च जानीयामिति सत्तमाः

mayā hi sumahattaptaṃ tapaḥ paramadāruṇambhūtaṃ bhavyaṃ bhaviṣyacca jānīyāmiti sattamāḥ

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