Matsya Purana — Cosmography of Śākadvīpa and Successive Dvīpas: Mountains
आरोग्या बलिनश्चैव सर्वे मरणवर्जिताः अवसर्पिणी न तेष्वस्ति तथैवोत्सर्पिणी पुनः //
ārogyā balinaścaiva sarve maraṇavarjitāḥ avasarpiṇī na teṣvasti tathaivotsarpiṇī punaḥ //
All of them are healthy and strong, and all are free from death. Among them there is neither avasarpiṇī, the downward course of decline, nor again utsarpiṇī, the upward course of improvement.
It describes an exceptionally stable, perfected condition of beings—deathless and unsubject to cyclical decline or rise—implying a cosmic phase where ordinary deterioration that leads toward dissolution is absent.
By portraying an ideal social-cosmic condition (health, strength, and stability), it sets a benchmark for governance and household ethics: rulers and householders should uphold order (dharma) that minimizes social ‘decline’ and promotes collective well-being.
No direct Vastu or ritual rule is stated; the takeaway is conceptual—Vastu/rituals in the Matsya Purana often aim to sustain harmony and avert ‘decline,’ aligning human space and practice with a stable cosmic order.