The Blessings of Imam Mahdi
Hujjat al-Islam Qeraati:
Imam Mahdi is the cause of mercy and blessing. Just as a lamp cannot be directly connected to a powerhouse, and needs a transformer, we also cannot achieve the blessing of God except by an intermediate cause and that cause is Imam Mahdi.
Because of his blessings other human beings are blessed.
Mahdism allegories, page 82, Doaye Adlieh