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
calaṁ yathā dṛṣṭipathaṁ paraiti sūkṣma-mahad rūpam ivābhibhāti | svarūpam ālocayate ca rūpaṁ paraṁ tathā buddhi-pathaṁ paraiti ||
毗湿摩说:譬如人坐于疾行之舟,岸上之树反似急速后退;如是,不动不变之我,因智之变相而似乎亦在变。又如借助镜片,细字见粗,小形见大;如是,微细之我与身及分别诸力之聚合相连,便被误认作身之形相。然而,正如明镜能现己面之影,清净之智亦能使人一瞥我之自性。
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.