Al-Muhasibi reported: It was said to Aisha, may Allah be pleased with her, “When does a man become villainous?” Aisha said, “When he thinks of himself as virtuous.”
Source: al-Ri’āyah li-Ḥuqūq Allāh 337
عن المحاسبي وقيل لعائشة رضي الله عنها متى يكون الرجل مسيئاً قالت إذا ظن أنه محسن
337 الرعاية لحقوق الله