Matsya Purana — Nārāyaṇa as Haṃsa in the Cosmic Ocean: Vedic Yajña-Puruṣa and Mārkaṇḍeya’s Vi...
ज्वलन्तमिव तेजोभिर् गोयुक्तमिव भास्करम् शर्वर्यां जाग्रतमिव भासन्तं स्वेन तेजसा //
jvalantamiva tejobhir goyuktamiva bhāskaram śarvaryāṃ jāgratamiva bhāsantaṃ svena tejasā //
Shining with his own radiance—like a blazing fire with its flames, like the sun yoked to its steeds, and like one who remains awake through the night—he appeared resplendent.
Indirectly, it emphasizes the Lord’s self-manifest radiance (tejas) that remains unwavering—an attribute often invoked in Pralaya contexts to show the Supreme as the constant light beyond cosmic darkness.
The image of being ‘awake in the night’ points to vigilance and steadfastness—qualities the Matsya Purana repeatedly associates with righteous kingship and disciplined household life (protecting dharma through alert governance and self-control).
While not giving a direct Vastu rule, the verse supplies iconographic/ritual mood-language: deities are to be conceived and worshipped as self-luminous (svatejasā bhāsantam), informing temple visualization, lamp-offerings (dīpa), and consecration meditations.