Matsya Purana — Nārāyaṇa as Haṃsa in the Cosmic Ocean: Vedic Yajña-Puruṣa and Mārkaṇḍeya’s Vi...
याथातथ्यं परं ज्ञानं भूतं तद्ब्रह्मणा पुरा रहस्यारण्यकोद्दिष्टं यच्चौपनिषदं स्मृतम् //
yāthātathyaṃ paraṃ jñānaṃ bhūtaṃ tadbrahmaṇā purā rahasyāraṇyakoddiṣṭaṃ yaccaupaniṣadaṃ smṛtam //
That supreme knowledge—truth exactly as it is—was formerly known to Brahmā; it is the secret teaching indicated in the Āraṇyakas and remembered as the Upaniṣadic doctrine.
It does not describe Pralaya directly; it frames the Purana’s teaching as Brahmā’s ancient, Upaniṣadic “supreme knowledge,” implying that true understanding transcends cosmic cycles.
By identifying “param jñāna” as the highest truth preserved in the Upaniṣads, it implies that royal and household duties should be guided by inner wisdom (self-knowledge and discernment), not merely external rule-following.
No Vāstu or iconographic rule is stated; the ritual takeaway is that the Purana aligns its instruction with Āraṇyaka–Upaniṣad authority, emphasizing contemplative, esoteric foundations behind rites.