Mahabharata 11.2.18

अनिष्टसंप्रयोगाच्च विप्रयोगात्प्रियस्य चमनुष्या मानसैर्दुःखैर्युज्यन्ते येऽल्पबुद्धयः

aniṣṭasaṃprayogācca viprayogātpriyasya camanuṣyā mānasairduḥkhairyujyante ye'lpabuddhayaḥ

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