राजधर्मप्रश्नः — Yudhiṣṭhira’s Inquiry into Rājadharma (Śānti-parva 56)
दुर्गेषु च महाराज षट्सु ये शास्त्रनिश्चिता: । सर्वदुर्गेषु मन्यन्ते नरदुर्ग सुदुस्तरम्
durgeṣu ca mahārāja ṣaṭsu ye śāstra-niścitāḥ | sarva-durgeṣu manyante nara-durgaṃ sudustaram ||
Sabi ni Bhishma: “O dakilang hari, yaong mga matatag sa mga pasya ng śāstra ay nagsasalita ng anim na uri ng kuta. Sa lahat ng kuta, itinuturing nilang ang ‘kuta ng tao’—ang tanggulang binubuo ng mga tao—ang pinakamahirap daigin.”
भीष्म उवाच
Effective defense and security ultimately depend most on people—trained, loyal, and organized human resources—more than on terrain or physical fortifications; hence the ‘human fortress’ is deemed the most formidable.
In the Śānti Parva’s instruction on kingship, Bhīṣma advises the king on principles of governance and protection of the realm, citing śāstric classifications of fortresses and emphasizing the superiority of manpower-based defense.