Matsya Purana — The Greatness of Prayāga
प्रधानहेतुं वक्ष्यामि श्रद्दधत्स्व च भारत यथा सर्वेषु भूतेषु ब्रह्म सर्वत्र दृश्यते //
pradhānahetuṃ vakṣyāmi śraddadhatsva ca bhārata yathā sarveṣu bhūteṣu brahma sarvatra dṛśyate //
O Bhārata, I shall explain the primal cause; have faith—so that you may understand how Brahman is seen everywhere, present within all beings.
It points to a single primal cause—Brahman—behind all manifested beings, implying that even through creation and dissolution the underlying reality remains all-pervading.
By urging faith and right understanding of the all-pervading Brahman, it supports ethical governance and household life grounded in humility, non-harm, and seeing the same divine reality in all subjects and beings.
No direct Vastu or ritual rule is stated; the takeaway is doctrinal—rituals and sacred spaces are meaningful when oriented to realizing Brahman as present everywhere, not only in a single shrine.