कुशल: सुखदु:खानां साधूंश्नाप्पथ सेवते । तस्य साधुसमाचारादभ्यासाच्चैव वर्धते,जो पुरुष अपनी बुद्धिसे राग आदि दोषोंको पहले ही देख लेता है, वह सुख-दुःखको समझनेमें कुशल होता है। फिर वह श्रेष्ठ पुरुषोंका सेवन करता है। सत्पुरुषोंकी सेवा या सत्संगसे और सत्कर्मोंके अभ्याससे उस पुरुषकी बुद्धि बढ़ती है
kuśalaḥ sukhaduḥkhānāṃ sādhūn snāppatha sevate | tasya sādhusamācārād abhyāsāc caiva vardhate |
Bhishma said: One who is discerning about pleasure and pain becomes truly skilled in understanding them. Such a person seeks the company of the virtuous and follows the right path. Through the good conduct of the righteous—by serving and associating with them—and through steady practice of noble actions, that person’s understanding and wisdom steadily grow.
भीष्म उवाच
Wisdom grows when one clearly understands pleasure and pain, keeps company with the virtuous, and repeatedly practices righteous conduct; discernment plus satsanga plus disciplined practice leads to increasing buddhi (understanding).
In the Shanti Parva’s instruction section, Bhishma continues advising on ethical living and inner cultivation, emphasizing that association with good people and consistent practice of good actions strengthens a person’s intelligence and moral clarity.