Matsya Purana — Soma
यदि वाश्रमधर्मेण प्रज्ञानेषु व्यवस्थितान् अन्ये चात्र प्रसीदन्ति श्रद्धायुक्तेषु कर्मसु //
yadi vāśramadharmeṇa prajñāneṣu vyavasthitān anye cātra prasīdanti śraddhāyukteṣu karmasu //
If, by observing the duties of one’s āśrama, people become firmly established in right understanding—and if others here too are thereby pleased—then one should undertake actions performed with faith (śraddhā).
This verse does not address pralaya directly; it focuses on āśrama-dharma and how faith-filled action (karma with śraddhā) stabilizes right understanding (prajñā) in human life.
It supports the idea that social order and approval (“others are pleased”) arise when one performs one’s prescribed duties according to āśrama-dharma, and that such duties should be carried out with śraddhā rather than mere formality.
No specific vastu or temple rule is stated; the ritual principle implied is that any prescribed rite or duty becomes spiritually effective when performed with śraddhā and aligned with one’s āśrama obligations.