Shloka 42
Vyaktāvyakta-Viveka and Nivṛtti as Paramā Gati
Manifest–Unmanifest Discrimination and the Supreme Path of Withdrawal
अग्निर्यथा हुपायेन मथित्वा दारु दृश्यते । तथैवात्मा शरीरस्थो योगेनैवात्र दृश्यते
agnir yathā upāyena mathitvā dāru dṛśyate | tathaivātmā śarīrastho yogenaivātra dṛśyate ||
毗湿摩阐释：正如火虽遍在木中，若不以正法钻木摩擦便不得见；同样，住于身内的真我并不直接显现，在此唯由瑜伽方能证得。其义在于：内在真理非凭外观观察或空谈论辩可得，而须以严谨修持，使本已存在者自显。
भीष्म उवाच
Educational Q&A
The Self is present within the body but is not an object of ordinary perception; it is made manifest through yoga, just as fire hidden in wood is revealed by the right method of churning.
In Śānti Parva, Bhīṣma instructs Yudhiṣṭhira on liberation-oriented dharma; here he uses a practical analogy (fire in wood) to clarify how spiritual discipline leads to direct realization of the indwelling Self.