Matsya Purana — Manvantaras
महात्मनः शरीरस्य चैतन्यात्सिद्धिरुच्यते पुरि शेते यतः पूर्वं क्षेत्रज्ञानं तथापि च //
mahātmanaḥ śarīrasya caitanyātsiddhirucyate puri śete yataḥ pūrvaṃ kṣetrajñānaṃ tathāpi ca //
The true attainment (siddhi) of the great embodied being is said to arise from the body’s consciousness; for the Knower of the Field (kṣetrajña) abides within the “city” (the body) from the very beginning, and so it remains.
Indirectly, it emphasizes what persists through change: the kṣetrajña (indwelling knower) remains within the ‘city’ of the body from the beginning, implying continuity of consciousness even as bodily states arise and pass.
It frames ethical life as rooted in inner awareness: a king or householder should govern senses and actions remembering the indwelling knower, treating the body as a managed ‘city’ and aiming at siddhi through disciplined consciousness.
Using the ‘puri’ (city) metaphor, the verse aligns with Vastu-style thinking: just as a city/house is organized around its presiding principle, the body is organized around the kṣetrajña—supporting ritual and Vastu readings that link outer structure with inner indweller.