The spiritual side of Hazrat Mahdi's (as) followers will be very powerful

Their [followers of Hazrat Mahdi (as)] souls are bright like lamps and their hearts are lighted as well. (Mikyaal al-Makaarem, vol. 1, p. 65)

The hadith suggests that Hazrat Mahdi’s (as) followers will have highly developed spiritual sides and will be people with deep faith who sincerely turn to Allah. Hazrat Mahdi (as) will be instrumental in these people having a strong love and fear of Allah, and related to this, their human love, nobility and feelings of affection will all be distinguishing features of theirs. The followers of Hazrat Mahdi (as) will be people who have freed their souls of such negative attributes as selfishness, envy, hatred and insincerity by bringing all their earthly passions under control.