Iman (Arabic: إيمان) is an Arabic term which denotes certitude or adherence to an idea. In Islamic theology, it refers to the inner aspect of the religion, and denotes a believer's faith in the metaphysical realities of Islam. [1][2] The term Iman has been delineated in both the Quran [3] as well as the famous Hadith of Gabriel. There exists a debate both within and outside Islam on the link between faith and reason in religion, and the relative importance of either. Several scholars contend that faith and reason spring from the same source and hence must be harmonious [4]
According to the Quran, Iman must be accompanied by evidence of righteous deeds, and the two together are necessary for entry into Paradise[5]. Also, since Iman is a quality of the heart / belief, it is impossible for anyone to judge who really is a believer. Iman is one of the three dimensions of the Islamic religion: islam, iman and ihsan.