Bede the Venerable — as excerpted in the Catena Aurea on Mark 11:19-26

“(ubi sup.) Or else, because the devil is often on account of his pride called by the name of a mountain, this mountain, at the command of those who are strong in the faith, is taken up from the earth and cast into the sea, whenever, at the preaching of the word of God by the holy doctors, the unclean spirit is expelled from the hearts of those who are fore-ordained to life, and is allowed to exert the tyranny of his power over the troubled and embittered souls of the faithless. At which time, he rages the more fiercely, the more he grieves at being turned away from hurting the faithful. It goes on: Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.”