Mahabharata 12.317.4

अनिष्टसंप्रयोगाच्च विप्रयोगात्प्रियस्य चमनुष्या मानसैर्दुःखैर्युज्यन्ते अल्पबुद्धयः

aniṣṭasaṃprayogācca viprayogātpriyasya camanuṣyā mānasairduḥkhairyujyante alpabuddhayaḥ

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