Matsya Purana — Tārakāsura’s Austerity and Boon; Mobilization for War; Bṛhaspati’s Fourfold P...
अवध्यः सर्वभूतानाम् अस्त्राणां च महौजसाम् स्यामहं परमो ह्येष वरो मम हृदि स्थितः //
avadhyaḥ sarvabhūtānām astrāṇāṃ ca mahaujasām syāmahaṃ paramo hyeṣa varo mama hṛdi sthitaḥ //
“May I be invulnerable to all beings, and even to mighty, blazing weapons. Indeed, this is the highest boon—one that abides firmly in my heart.”
It reflects the Pralaya-context anxiety for survival: Manu seeks a boon of invulnerability against beings and powerful weapons, indicating a world where extraordinary threats are expected during cosmic upheaval.
It frames protection as a prerequisite for dharma: a ruler (or responsible householder) seeks steadfast security not for aggression, but to remain capable of safeguarding life and maintaining righteous order amid crisis.
No direct Vastu or temple-building rule is stated; the verse is a boon-request formula emphasizing ritual intent (saṅkalpa) and inner resolve (“in my heart”), which parallels how vows are framed in Purāṇic rites.