Matsya Purana — Manvantaras
सांसिद्धिके शरीरे च बुद्ध्याव्यक्तस्तु चेतनः एवं विवृत्तः क्षेत्रज्ञः क्षेत्रं ह्यनभिसंधितः //
sāṃsiddhike śarīre ca buddhyāvyaktastu cetanaḥ evaṃ vivṛttaḥ kṣetrajñaḥ kṣetraṃ hyanabhisaṃdhitaḥ //
Even in the perfected (sāṃsiddhika) body, the conscious principle remains unmanifest to the buddhi (intellect). Thus the Knower of the Field (kṣetrajña), being so distinguished, is not truly bound up with the Field (kṣetra).
Indirectly, it frames the Self (kṣetrajña) as untouched by changing conditions of the field (kṣetra); therefore even cosmic changes like pralaya pertain to the field, not to pure consciousness.
It supports disciplined action without ego-identification: a king or householder performs duties in the ‘field’ (body, mind, society) while remembering the Self is distinct, reducing attachment, fear, and grief.
No direct Vāstu or ritual rule is stated; the takeaway is inner discipline—rituals and works belong to the kṣetra, while liberation comes from knowing the kṣetrajña as separate.