Matsya Purana — Duties of the Four Āśramas and the Power of Mauna
*ययातिरुवाच आहूताध्यायी गुरुकर्मसु चोद्यतः पूर्वोत्थायी चरमं चोपशायी मृदुर्दान्तो धृतिमानप्रमत्तः स्वाध्यायशीलः सिध्यति ब्रह्मचारी //
*yayātiruvāca āhūtādhyāyī gurukarmasu codyataḥ pūrvotthāyī caramaṃ copaśāyī mṛdurdānto dhṛtimānapramattaḥ svādhyāyaśīlaḥ sidhyati brahmacārī //
Yayāti said: The brahmacārin who studies when summoned, who is prompt in the duties of the teacher, who rises before others and lies down last, who is gentle and self-controlled, steadfast and vigilant, and devoted to self-study (svādhyāya)—such a student attains success in sacred learning and discipline.
This verse does not discuss Pralaya; it focuses on personal discipline—how a brahmacārin should serve the guru and maintain vigilant conduct to succeed in sacred learning.
Though addressed as brahmacārin-dharma, it supports wider governance and household ethics: self-control, diligence, and non-negligence are foundational virtues that later shape a capable householder and a disciplined king.
No Vāstu or temple-architecture rule appears here; the closest ritual-religious point is svādhyāya—regular Vedic recitation and study as a core discipline supporting correct ritual knowledge.