Mahabharata 14.42.49

यदा पश्यति भूतानि प्रसन्नात्मात्मनो हृदिस्वयंयोनिस्तदा सूक्ष्मात्सूक्ष्ममाप्नोत्यनुत्तमम्

yadā paśyati bhūtāni prasannātmātmano hṛdisvayaṃyonistadā sūkṣmātsūkṣmamāpnotyanuttamam

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