The difference that we Shiites have with other Islamic and non-Islamic sects is that we know this dear and great person; his name, his date of birth, his parents and his beloved ancestors, we know his “concerns”, but others do not know these... That's why Shiites’ resorts are  "livelier" and "more enthusiastic" and "more meaningful" and "more focused

The basic principle of Mahdism principle is agreed on among all Muslims... But in the main part which is the "the knowledge of the Savior himself" there is inconsistent insight. Shiites, through their certain news, know the Savior by his name, specification, and his date of birth

Supreme Leader, 74/10/17 - 84/6/29