Al-Qushayri reported: Abu al-Husayn al-Warraq, may Allah have mercy on him, said, “Whomever we hated to meet, we would not take revenge for our own sake. Rather, we would excuse him and show humility towards him. If we felt disdain enter our hearts for anyone, we would commit ourselves to his service and good treatment until it disappeared.”
Source: al-Risālah al-Qushayrīyah 1/220
عن القشيري قال أبو الْحُسَيْن الوراق رحمه الله من استقبلنا بمكروه لا ننتقم لأنفسنا بَل نعتذر إِلَيْهِ ونتواضع لَهُ وإذا وقع فِي قلوبنا حقارة لأحد قمنا بخدمته والإحسان إِلَيْهِ حَتَّى يزول
1/220 الرسالة القشيرية