Matsya Purana — Inquiry into Taraka’s Slaying and the Prelude to Guha
नियमे वर्त हे देवि सहस्रं शुचिमानसा वर्षाणां लप्स्यसे पुत्रम् इत्युक्ता सा तथाकरोत् //
niyame varta he devi sahasraṃ śucimānasā varṣāṇāṃ lapsyase putram ityuktā sā tathākarot //
“Abide, O goddess, in disciplined observance (niyama) with a purified mind for a thousand years; you shall obtain a son.” Thus addressed, she acted accordingly.
Nothing directly—this verse focuses on niyama (disciplined observance) and the promised fruit of progeny, not on pralaya or cosmology.
It emphasizes disciplined conduct and mental purity sustained over time—core householder virtues in the Matsya Purana—showing that desired aims like progeny are framed as outcomes of dharmic restraint rather than mere desire.
No Vastu or temple-building rule is stated here; the ritual takeaway is the primacy of niyama (regulated vow/observance) and śuci-manas (inner purity) as prerequisites for attaining a boon.