Mahabharata 12.112.81

दुःखेन श्लेष्यते भिन्नं श्लिष्टं दुःखेन भिद्यतेभिन्नश्लिष्टा तु या प्रीतिर्न सा स्नेहेन वर्तते

duḥkhena śleṣyate bhinnaṃ śliṣṭaṃ duḥkhena bhidyatebhinnaśliṣṭā tu yā prītirna sā snehena vartate

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