In Islamic theology, 'Al-Ghurur' refers to a profound state of delusion or self-deception, a critical spiritual disease that veils the heart from reality. Search-discovered classical scholarship, particularly the tafsir of Ibn Kathir, explains Ghurur as being enticed by falsehood, primarily stemming from two sources: the allure of the temporary worldly life (Dunya) and the deceptive promises of Shaytan. The Quran, across 22 verses including 31:33 and 35:5, warns humanity not to let this present life delude them, nor to be deceived about Allah by 'Al-Gharur' (The Great Deceiver), who is identified by scholars as Shaytan. Al-Qurtubi's analysis further highlights that this delusion manifests as false hopes and doubts, causing individuals to forget the certainty of the Hereafter until it is too late, as vividly depicted in Surah Al-Hadid (57:14). The synthesis of these verses establishes Ghurur not merely as a mistake, but as a dangerous spiritual state that forms a core obstacle to faith and salvation.