"By God, the earth is never going to be without the one who rises for God with proof, (be he) either known and manifest or hidden and fearful.
So that the proof of God and His clear evidence is not invalidated." Reported from Imam Ali (as)

Imam Mahdi is the inheritor of the deep knowledge of the Holy Prophet. He is the proof of God and His voice among [...] is truthful and precise in everything. He possesses hukm, a divine mandate, and knowledge of the Names. His presence is necessary to uphold the divine connection between the realm of this world and higher worlds without which the purpose of the creation of humanity-which is to be guided towards perfection by God-would vanish. When he returns, his mission will be to fill the world with justice after it has been filled with oppression. By exploring verses of the Qur'an and the hadith corpus, this book seeks to understand each of these spiritual positions and how Imam Mahdi will accomplish his mission.