"Jesus summoned his Twelve disciples and gave them authority over unclean spirits to drive them out..." (Mt. 10:1)
Unclean spirits (demons) possess the angelic nature which is superior to the human nature. Scripture speaks of man as made "lower than the angels." And so, when our Lord bestowed the authority to drive away evil spirits to his apostles who were mere human beings, he gave creatures of inferior nature the authority to cast out creatures of superior nature. In this way, the Lord humiliates the pride of Lucifier."He has cast down the mighty from their thrones and has lifted up the lowly."
The humiliation of Lucifer began with the promise of the Woman who will crush the serpent's head. Not only did the Lord give this sublime honor of crushing the serpent's head to a human being who was created "lower than the angels." He made the humiliation even worse by declaring that this human being be a Woman.
Christ gave bishops and exorcists this power to cast out evil spirits. Bishops and exorcists are ordained men. Those who have engaged in this ministry have constantly called upon Our Lady to assist them in casting out demons. And those who call on her do not call in vain. To his most humble of all creatures, the Lord has bestowed the singular dignity of crushing the serpent's head.