Matsya Purana — Inquiry into Taraka’s Slaying and the Prelude to Guha
तपसो ऽन्ते भगवती जनयामास दुर्जयम् पुत्रमप्रतिकर्माणम् अजेयं वज्रदुश्छिदम् //
tapaso 'nte bhagavatī janayāmāsa durjayam putramapratikarmāṇam ajeyaṃ vajraduśchidam //
At the culmination of her austerities, the revered goddess gave birth to a son who was hard to overpower—one against whom no counteraction could prevail, unconquerable, and as unbreakable as a thunderbolt.
This verse is not about Pralaya; it highlights creative power through tapas—how austerity culminates in the manifestation of an extraordinary, “unconquerable” son.
It underscores the Purāṇic ethic that disciplined tapas and steadfast conduct generate strength and protection for one’s lineage—an ideal often applied to rulers and householders seeking stability, heirs, and resilience against adversity.
No direct Vāstu or temple-building rule appears here; the ritual takeaway is the primacy of tapas (austerity) as a potency-building discipline that culminates in tangible results.