Matsya Purana — The Greatness of Prayāga
क्लिश्यते चापरस्तत्र नैव योगमवाप्नुयात् जन्मान्तरसहस्रेभ्यो योगो लभ्येत मानवैः //
kliśyate cāparastatra naiva yogamavāpnuyāt janmāntarasahasrebhyo yogo labhyeta mānavaiḥ //
Another person, though striving there, becomes worn down and still does not attain Yoga; for human beings, Yoga is obtained only after thousands of births.
This verse does not describe Pralaya directly; it emphasizes the long karmic timescale of spiritual progress, implying that liberation-oriented Yoga matures across many rebirths rather than in a single life.
It frames Yoga as difficult and long-term, encouraging kings and householders to practice steady dharma, self-control, and disciplined sādhanā without impatience—accepting gradual purification over lifetimes.
No Vāstu or temple-building rule is stated in this verse; its takeaway is soteriological—Yoga is hard-won and requires sustained effort rather than external ritual/architectural prescriptions.