Matsya Purana — Characteristics of Dvāpara and Kali Yugas
एष धर्मः स्मृतः कृत्स्नो धर्मश्च परिहीयते मनसा कर्मणा वाचा वार्त्ताः सिध्यन्ति वा न वा //
eṣa dharmaḥ smṛtaḥ kṛtsno dharmaśca parihīyate manasā karmaṇā vācā vārttāḥ sidhyanti vā na vā //
This is remembered as the whole of dharma; and dharma is diminished when one errs in mind, deed, and speech—whether one’s worldly pursuits and undertakings succeed or do not succeed.
It does not describe pralaya directly; instead, it states a moral principle: dharma is preserved or diminished by one’s intentions, words, and actions, regardless of external success.
It frames duty as a threefold discipline—pure intent (mind), lawful conduct (action), and truthful/beneficial speech—implying that a king’s policy and a householder’s livelihood must be ethically grounded even when outcomes are uncertain.
No specific Vastu or ritual procedure is named; the takeaway is foundational: any temple-building, donation, or rite must be supported by integrity in thought, speech, and action, otherwise its dharmic merit is reduced.