According to search-discovered classical Islamic scholarship, the concept of conceit, expressed in the Quran with terms like 'mukhtal' (self-deluded) and 'fakhur' (boastful), is a severely condemned spiritual disease. Tafsir by authorities like Ibn Kathir on verses 4:36 and 57:23 clarifies that this refers to an arrogant individual who is pleased with themselves and boastful to others, while being ungrateful to Allah for His blessings. This trait is a manifestation of inner pride (kibr), which Islamic tradition considers the first sin of Iblis (Satan) and a primary barrier to divine guidance. The synthesis of the Quranic verses shows that conceit is discouraged both in our social interactions, where it breeds injustice, and in our internal state, where it corrupts our relationship with Allah by denying Him as the ultimate source of all good. Overcoming conceit through gratitude (shukr) and humility (tawadu') is therefore essential for spiritual purification.