Nārada’s Darśana of Viśvarūpa Nārāyaṇa and the Caturmūrti Doctrine (नारदस्य नारायणदर्शनं चतुर्मूर्तिविचारश्च)
यदा श्राव्ये च दृश्ये च सर्वभूतेषु चाप्पययम् । समो भवति निर्दन्द्धो ब्रह्म सम्पद्यते तदा,जब यह साधक सुनने और देखने योग्य पदार्थोमें तथा सम्पूर्ण प्राणियोंमें समान भाववाला हो जाता है एवं सुख-दुःख आदि द्वल्धोंसे रहित हो जाता है, उस समय वह ब्रह्मभावको प्राप्त हो जाता है
yadā śrāvye ca dṛśye ca sarvabhūteṣu cāpy ayam | samo bhavati nirdvandvo brahma sampadyate tadā ||
When this seeker becomes even-minded toward what is heard and what is seen, and toward all beings as well—free from the pairs of opposites such as pleasure and pain—then he attains the state of Brahman.
जनक उवाच
Liberation (attaining Brahman) arises when one becomes even-minded toward sensory experience (what is heard and seen) and toward all beings, remaining free from dualities like pleasure and pain.
King Janaka is instructing on the marks of realization: the seeker’s mind becomes impartial and undisturbed by opposites, and this inner state culminates in Brahman-realization.