Do Not Be Obsessive in Love & Hate

“Do not let your love be obsessive and do not let your hatred be destructive.
When you love, do not go to a level of obsession as a child does with the thing he loves;
and when you hate, do not hate in such a way that you want your opponent to be destroyed and doomed.”

Umar Ibn al-Khattab r.a.
Narrated by Abd ar-Razzaaq in al-Musannaf, 20