Mahabharata 12.313.40

तमःपरिगतं वेश्म यथा दीपेन दृश्यतेतथा बुद्धिप्रदीपेन शक्य आत्मा निरीक्षितुम्

tamaḥparigataṃ veśma yathā dīpena dṛśyatetathā buddhipradīpena śakya ātmā nirīkṣitum

Our plain-language meaning of this verse is waiting for scholar review.