Mahabharata 12.135.1

भीष्म उवाच · bhīṣma uvāca

अत्रैव चेदमव्यग्रः शृण्वाख्यानमनुत्तमम्दीर्घसूत्रं समाश्रित्य कार्याकार्यविनिश्चये

atraiva cedamavyagraḥ śṛṇvākhyānamanuttamamdīrghasūtraṃ samāśritya kāryākāryaviniścaye

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