Very rare, elect people, those who are specifically been inspired by God, those who are taken into a deep sleep approach the Mahdi (pbuh). Just like the People of the Cave. Such a person would not be able to go anywhere even if he wants to, because it is in his destiny. The will of a genuine student of the Mahdi would not be able to leave him. But the other ones cannot become his students even if they want to. - Harun Yahya