Matsya Purana — Marks of Karma-yoga and the Five Great Daily Sacrifices
तस्मात्कर्मणि युक्तात्मा तत्त्वमाप्नोति शाश्वतम् वेदो ऽखिलो धर्ममूलम् आचारश्चैव तद्विदाम् //
tasmātkarmaṇi yuktātmā tattvamāpnoti śāśvatam vedo 'khilo dharmamūlam ācāraścaiva tadvidām //
Therefore, one whose inner self is disciplined and engaged in rightful action attains the eternal Truth. The entire Veda is the very root of Dharma, and so too is the established conduct of those who truly know it.
This verse is not about Pralaya; it teaches the perennial foundation of Dharma—disciplined action grounded in Veda and validated by the lived conduct (ācāra) of true knowers.
It frames duty as karma performed with self-discipline: a king should govern and judge by Vedic dharma and the tested conventions of the wise, while a householder should align daily conduct with scripture and the standards of sādhus and learned teachers.
No specific Vāstu rule is stated, but it establishes a method: ritual and temple-building practices should be rooted in Vedic authority and in the accepted ācāra of expert tradition-bearers—useful for “Matsya Purana Vastu Shastra tips” where scripture and lineage-practice jointly guide procedure.