Matsya Purana — War of Devas and Asuras; Birth of Aurva Fire; Countering Tamasī Māyā through ...
यद्यस्ति तपसो वीर्यं युष्माकं विदितात्मनाम् सृजध्वं मानसान्पुत्रान् प्राजापत्येन कर्मणा //
yadyasti tapaso vīryaṃ yuṣmākaṃ viditātmanām sṛjadhvaṃ mānasānputrān prājāpatyena karmaṇā //
If the power of austerity truly abides in you—who are knowers of the Self—then bring forth sons born of the mind, by the Prajāpati-ordained act of creation.
It speaks to creation (sarga), specifically the idea that intense tapas can generate mind-born progeny under Prajāpati’s ordinance—an alternative mode of creation rather than a pralaya description.
Indirectly, it frames procreation and continuity of lineage as a dharmic aim; for householders this is fulfilled through family life, while for realized ascetics the text presents a higher, tapas-based “Prajāpati mode” of generating progeny.
The key ritual idea is “prājāpatya karma”—a Prajāpati-sanctioned creative act/rite—rather than Vāstu; it highlights that creation can be treated as a sacred, rule-governed rite.