Varāha-avatāra: Viṣṇu’s subterranean intervention and the cosmic nāda (Śānti-parva 202)
चलं॑ यथा दृष्टिपथं परैति सूक्ष्म महद् रूपमिवाभिभाति । स्वरूपमालोचयते च रूप॑ परं तथा बुद्धिपथं परैति,जैसे शीघ्रगामी नौकापर बैठे हुए पुरुषकी दृष्टिमें पार्श्ववर्ती वृक्ष पीछेकी ओर वेगसे भागते हुए दिखायी देते हैं, उसी प्रकार कूटस्थ निर्विकारी आत्मा बुद्धिके विकारसे विकारवान्-सा प्रतीत होता है एवं जैसे चश्मे या दूरबीनसे महीन अक्षर मोटा दीखता है और छोटी आकृति बहुत बड़ी दिखायी देती है, उसी प्रकार सूक्ष्म आत्मतत्त्व भी बुद्धि, विवेक- समूह शरीरसे संयुक्त होनेके कारण शरीरके रूपमें प्रतीत होने लगता है। तथा जैसे स्वच्छ दर्पण अपने मुखका प्रतिबिम्ब दिखा देता है, उसी प्रकार शुद्ध बुद्धिमें आत्माके स्वरूपकी झाँकी उपलब्ध हो जाती है
calaṁ yathā dṛṣṭipathaṁ paraiti sūkṣma-mahad rūpam ivābhibhāti | svarūpam ālocayate ca rūpaṁ paraṁ tathā buddhi-pathaṁ paraiti ||
Bhishma said: Just as, to a man seated in a swiftly moving boat, the trees on the bank seem to rush backward, so the changeless, immutable Self appears as though it were subject to change because of the modifications of the intellect. And just as through a lens fine letters look thick and a small form appears very large, so too the subtle reality of the Self, when conjoined with the body and the aggregate of discriminative faculties, is taken to be the body’s form. Yet, as a clear mirror reveals the reflection of one’s face, so a purified intellect affords a glimpse of the Self’s own nature.
भीष्म उवाच
The Self is intrinsically changeless (kūṭastha), but due to the intellect’s modifications and association with body-mind, it is misperceived as changing and embodied. When the intellect is purified and made clear, it can reflect the Self’s true nature, enabling right discernment and progress toward moksha.
In Shanti Parva’s instruction to Yudhishthira, Bhishma explains a philosophical point about mistaken perception: motion and magnification analogies illustrate how the mind/intellect can project change and grossness onto the subtle, immutable Self; he then adds the mirror analogy to show how a purified intellect can reveal the Self.