Balanced love and hatred in relationships
Nahj al-Balāgha|Volume 1|Book 3|Chapter 268
٢٦٨. وَقَالَ (عليه السلام): أَحْبِبْ حَبِيبَكَ هَوْناً مَا عَسَى أَنْ يَكُونَ بَغِيضَكَ يَوْماً مَا، وَأَبْغِضْ بَغِيضَكَ هَوْناً مَا عَسَى أَنْ يَكُونَ حَبِيبَكَ يَوْماً مَا.
268. Amīr al-mu’minīn, peace be upon him, said: Have love for your friend up to a limit, for it is possible that he may turn into your enemy some day; and hate your enemy up to a limit for it is possible that he may turn into your friend some day.