Matsya Purana — Dialogue of Aṣṭaka and Yayāti: Exhaustion of Merit
*अष्टक उवाच अन्यद्वपुर्विदधातीह गर्भ उताहोस्वित्स्वेन कामेन याति आपद्यमानो नरयोनिमेताम् आचक्ष्व मे संशयात्पृच्छतस्त्वम् //
*aṣṭaka uvāca anyadvapurvidadhātīha garbha utāhosvitsvena kāmena yāti āpadyamāno narayonimetām ācakṣva me saṃśayātpṛcchatastvam //
Aṣṭaka said: “Does the embryo here fashion for itself another body, or does it—driven by its own desire—enter upon and attain this human womb? Tell me clearly, for I ask you in doubt.”
This verse is not about cosmic dissolution; it focuses on individual embodiment—how an embryo/jīva comes to a human womb, whether by self-formation of a body or by the force of its own desire.
By framing human birth as a consequence of inner impulses (kāma) and the process of embodiment, it underlines why self-restraint, ethical conduct, and regulated desire are central virtues for householders and rulers in Purāṇic dharma.
No Vāstu or temple-building rule is stated here; the verse belongs to doctrinal inquiry (garbha/jīva entry into the womb), not architectural or ritual procedure.