Matsya Purana — Agastya’s Origin
यदा च मानुषत्वे ऽपि त्वयागस्त्येन शोषितः भविष्यत्युदधिर्वह्ने तदा देवत्वमाप्स्यसि //
yadā ca mānuṣatve 'pi tvayāgastyena śoṣitaḥ bhaviṣyatyudadhirvahne tadā devatvamāpsyasi //
And when—even while you remain in human form—the ocean, O Fire, is dried up by you through Agastya, then you will attain divinity.
It points to a cosmic-scale event—drying up the ocean—used as a marker of world-cycle transformation, where extraordinary acts accompany shifts in divine order.
Indirectly, it reinforces the Purāṇic ethic that dharma includes cooperation with sages and cosmic law—great changes occur through disciplined agency and alignment with higher purpose, not mere power.
No explicit Vāstu or temple-building rule appears in this verse; its ritual takeaway is the Purāṇic idea of consecration-by-cosmic-act, where divinity is attained through ordained, world-ordering deeds.