Matsya Purana — Brahmā–Gāyatrī as a Divine Pair and the Early Genealogies of Creation
कार्याकार्ये न देवानां शुभाशुभफलप्रदे यस्मात्तस्मान्न राजेन्द्र तद्विचारो नृणां शुभः //
kāryākārye na devānāṃ śubhāśubhaphalaprade yasmāttasmānna rājendra tadvicāro nṛṇāṃ śubhaḥ //
Because the gods do not directly determine what is to be done and what is not to be done—even though they bestow auspicious and inauspicious results—therefore, O best of kings, such over-analysis is not wholesome for human beings.
Nothing directly about pralaya is stated here; the verse instead clarifies karma-phala: gods dispense results, while human beings must still choose right action without paralyzing doubt.
It advises a ruler (and by extension any person) not to hide behind fate or divine will when judging duty; one should act according to dharma, accepting that outcomes (good or bad) will follow as karmic fruits.
No Vastu or ritual procedure is mentioned; the takeaway is ethical—avoid excessive speculation about divine causation and focus on dharmic action.