The conflict between good and evil has existed on the earth since the beginning of life. Therefore, this conflict will persist between the two line of guidance and the line of error - the line of prophets and the line of ignorant tyrants.
Indeed, victory was achieved for the Islamic message under the leadership of the pure movement and built the civilization of monotheism. Thus, people achieved wonderful successes in knowledge and faith when they followed his bright guidance.
However, this movement became weak. As a result, a corrupt, ignorant civilization has become active. Accordingly, the movement of Islamic civilizations, has retreated, and during which man has been deprived of living under fairness, justice, and peace. The evil deeds of ignorant civilizations have, again, come back to prevail over man's life. So, the earth had become full of oppression and tyranny to the extent that even the true faithful were about to feel despair and pessimism had not Allah's promise to help and support His great religion prevailed. That which would establish massive justice and put an end to evil and corruption and make great common changes at the hand of the one who will reform people, put the practices of the prophets into effect, and change life according life according to the Qur'an and the purified traditions of the Prophet. He is the one who will guide this community.
This reformer is named "the Mahdi of this umma", by the Messenger of Allah (s.a.w.), in various narrations and that is a true promise proclaimed by the Qur'an and mentioned by other Divine Books.
