Matsya Purana — The Viśokā-Saptamī Vow
यं यं प्रार्थयते कामं तं तमाप्नोति पुष्कलम् निष्कामः कुरुते यस्तु स परं ब्रह्म गच्छति //
yaṃ yaṃ prārthayate kāmaṃ taṃ tamāpnoti puṣkalam niṣkāmaḥ kurute yastu sa paraṃ brahma gacchati //
Whatever desire a person prays for, that very desire he attains in abundance; but the one who acts without desire attains the Supreme Brahman.
This verse does not address pralaya directly; it teaches a moral-spiritual law: desires yield corresponding results, while desireless action leads beyond worldly outcomes to Brahman.
It supports the Matsya Purana’s ethical guidance that rulers and householders should perform prescribed duties without selfish craving for reward—governing, giving, and protecting as dharma—thereby gaining inner purity and liberation-oriented merit.
No specific vāstu or temple rule is stated; ritually, it implies that worship and rites done for personal boons grant results, but rites performed in a niṣkāma spirit become liberating rather than merely wish-fulfilling.