Matsya Purana — Characteristics of Dvāpara and Kali Yugas
कृत्वा बीजावशिष्टां तां पृथ्वीं क्रूरेण कर्मणा परस्परनिमित्तेन कालेनाकस्मिकेन च //
kṛtvā bījāvaśiṣṭāṃ tāṃ pṛthvīṃ krūreṇa karmaṇā parasparanimittena kālenākasmikena ca //
Having reduced the earth to a condition where only seed remained, through cruel deeds—arising from the mutual causation among beings and from the sudden, unforeseen workings of Time—so it came to pass.
It frames large-scale ruin as a combined result of harsh collective karma, reciprocal human/creature causation, and the overpowering agency of Time—so that the earth is left with only the “seed” (a minimal remainder for renewal after devastation).
By warning that cruelty and socially contagious wrongdoing (paraspara-nimitta) accelerate decline, it indirectly supports the Matsya Purana’s dharmic ideal: rulers and householders must restrain harm, uphold order, and prevent cycles of mutual corruption that invite sudden calamity.
No direct Vastu or ritual procedure is stated; the verse is cosmological-ethical, emphasizing Kala and karma as forces that can abruptly undo prosperity—an implied reminder that rites and constructions require dharmic conduct to be enduring.