Survey the mechanism of the clarity of Imam Mahdi (As) Advent as a Fact

According to numerous hadiths, when the Imam of the Age appears, this event will be a clear fact. Degree of the clarity of this matter is also different in relation to various addressors of the Imam, like Shiites, other Muslims, the people of the Book and the non-Book people. For those who desire the Imam and feel the need for him, the matter of the Imam and his purpose and goals are clear from the beginning and before the Advent. But to those who did not meet such a need, due to the extent of their knowledge and growth, the matter of the Imam becomes clear gradually. For some, when they see strange signs and events, it becomes clear to them, to some people with clear evidence. But this kind of reasons is not enough for some other people ,so the Imam, according to the divine tradition that all human beings should be convinced by God Messengers and Saints, to clarify his Fact, begins to present evidences ,heritages, miracles, prophets Books and Coming back of Christ.