"Umar ibn al-Khattab (RA) said, ‘Do not let your love be a total infatuation. Do not let your anger be destruction.’ He was asked, ‘How is that?’ He replied, ‘When you love, you are infatuated like a child. When you hate, you desire destruction for your companion.’"
Al-Adab Al-Mufrad page. 263 of Imam Bukhari