Matsya Purana — Measures of Time: Caturyuga Computation
आयूरूपं बलं मेधा आरोग्यं धर्मशीलता सर्वसाधारणं ह्येतद् आसीत्त्रेतायुगे तु वै //
āyūrūpaṃ balaṃ medhā ārogyaṃ dharmaśīlatā sarvasādhāraṇaṃ hyetad āsīttretāyuge tu vai //
Long life, beauty of form, strength, intelligence, good health, and a disposition grounded in dharma—these were, indeed, qualities commonly shared by all in the Tretā Yuga.
This verse does not describe pralaya directly; it characterizes the Tretā Yuga as an age where health, longevity, and dharmic conduct were naturally widespread, implying a more orderly cosmic-moral condition than later ages.
By presenting dharma-śīlatā (a dharmic disposition) as the societal norm in Tretā Yuga, the verse frames the king’s and householder’s duties as sustaining health, strength, and moral order—ideals that governance and domestic discipline should aim to protect, especially as yugas decline.
No explicit Vāstu or ritual rule is stated here; the takeaway is contextual—ritual life and sacred construction are understood to flourish more easily in an age where people are healthy, intelligent, and naturally dharmic.