Matsya Purana — Catalogue of the Eighteen Puranas
धर्मश्चार्थश्च कामश्च मोक्षश्चैवात्र कीर्त्यते सर्वेष्वपि पुराणेषु तद्विरुद्धं च यत्फलम् //
dharmaścārthaśca kāmaśca mokṣaścaivātra kīrtyate sarveṣvapi purāṇeṣu tadviruddhaṃ ca yatphalam //
Here Dharma, Artha, Kāma, and also Mokṣa are proclaimed. In all the Purāṇas, whatever fruit is contrary to these four aims is to be rejected as an improper result.
This verse does not discuss Pralaya directly; it sets a doctrinal filter for Purāṇic teaching—true Purāṇic “fruit” must align with the four aims of life (dharma, artha, kāma, mokṣa), which also frame how Pralaya narratives are meant to instruct rather than merely entertain.
It states that rightful governance and household life should pursue artha and kāma only under dharma and ultimately oriented toward mokṣa; any gain or pleasure obtained in ways opposed to dharma (or that blocks liberation) is an invalid or harmful outcome.
No specific Vāstu or ritual rule is named, but the principle applies: temple-building, iconography, and rites in the Matsya Purāṇa are legitimate only when they support dharma and lead toward auspicious welfare and mokṣa—not when they produce results contrary to these aims.