सूर्यरथ-कालचक्र-आयनविभागः, संध्योपासनम्, देवयान-पितृयानम्, विष्णुपद-गङ्गावतरणम्
तेजसी भास्कराग्नेये प्रकाशोष्णस्वरूपिणी परस्परानुप्रवेशाद् आप्यायेते दिवानिशम्
tejasī bhāskarāgneye prakāśoṣṇasvarūpiṇī parasparānupraveśād āpyāyete divāniśam
The two radiant powers—of the Sun and of Fire—whose very nature is illumination and heat, continually nourish and intensify one another through mutual interpenetration, day and night.
Sage Parāśara (teaching Maitreya)
Speaker: Parasara
Topic: How solar and fiery tejas mutually intensify through parasparānupraveśa (mutual interpenetration)
Teaching: Cosmological
Quality: revealing
Cosmic Hierarchy: Lokas
Concept: Sun-tejas and fire-tejas, both of the nature of light and heat, increase one another continuously through mutual interpenetration across day and night.
Vedantic Theme: Dharma
Application: Meditate on interconnectedness: cultivate sattva by aligning one’s inner ‘fire’ (discipline) with higher light (wisdom), letting each strengthen the other.
Vishishtadvaita: The notion of parasparānupraveśa can be read analogically with Viśiṣṭādvaita’s stress on real relations and coordinated plurality within a single ordered reality under the Supreme.
Vishnu Form: Para-Brahman
Bhakti Type: Shanta
This verse presents light and heat as mutually reinforcing cosmic powers—showing how the universe is sustained through coordinated functions rather than isolated forces.
By stating that these powers increase “day and night,” Parāśara frames cosmic regularity (cycles like divā-niśam) as an ongoing, dependable structure within creation.
Even when Vishnu is not named, the Purana’s cosmology implies that such sustaining principles (light/heat and their harmony) operate under Vishnu’s supreme governance as the underlying reality of the world-order.