तस्मात् ते वर्तयिष्यामि दुर्गकर्म विशेषत: । श्रुत्वा तथा विधातव्यमनुष्ठेयं च यत्नत:
tasmāt te vartayiṣyāmi durgakarma viśeṣataḥ | śrutvā tathā vidhātavyam anuṣṭheyaṃ ca yatnataḥ ||
Therefore, I shall explain to you—especially in detail—the course of action to be followed in difficult undertakings. Having heard it, you should act accordingly and carry it out with careful effort.
भीष्म उवाच
When facing difficult undertakings, one should first listen carefully to sound guidance and then implement it exactly, with sustained diligence; right action requires both correct instruction and earnest execution.
Bhīṣma, speaking as an instructor in the Śānti Parva, signals that he will now set out a specific, detailed teaching on how to proceed in challenging matters, and urges the listener to put it into practice with effort.