Matsya Purana — The Strategy to Defeat Tāraka: Pārvatī’s Birth
तपांसि दीर्घचीर्णानि मुनीनां भावितात्मनाम् तस्मिन्गतानि साफल्यं काले निर्मलचेतसाम् //
tapāṃsi dīrghacīrṇāni munīnāṃ bhāvitātmanām tasmingatāni sāphalyaṃ kāle nirmalacetasām //
The long-practised austerities of sages, whose inner selves are disciplined, attain their true fruition in due time, when the mind has become pure and stainless.
This verse does not describe Pralaya directly; it teaches a general Purāṇic principle that spiritual effort (tapas) matures only in the proper time, especially when the mind becomes purified.
It implies that dharmic results come through sustained discipline and inner purification—guiding kings and householders to practice self-control, patience, and ethical conduct rather than expecting immediate rewards.
No specific Vāstu or temple rule is stated; the ritual takeaway is that rites and vows achieve their intended efficacy when performed steadily over time with a purified mind.