Mahabharata 12.283.26

इष्टानिष्टसमायोगो वैरं सौहार्दमेव चअथ जातिसहस्राणि बहूनि परिवर्तते

iṣṭāniṣṭasamāyogo vairaṃ sauhārdameva caatha jātisahasrāṇi bahūni parivartate

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