In his hadiths, our Prophet (saas) says that Hazrat Mahdi (pbuh) "will continue his struggle until all people turn to the Truth." So that means he will not quit. What is the extent of it? All people turning to the Truth; that is the determination of the Mahdi (pbuh). The whole humanity. The North Pole, Africa and all around. What is the truth? It is Islam. - Harun Yahya