Give heed to the cause of the holy Roman Church, mother of all churches and teacher of the faith, whom you by the order of God, have consecrated by your blood. Against the Roman Church, you warned, lying teachers are rising, introducing ruinous sects, and drawing upon themselves speedy doom. Their tongues are fire, a restless evil, full of deadly poison. They have bitter zeal, contention in their hearts, and boast and lie against the truth.
Pope Leo XIf the Almighty in his mercy allows us to settle peace among the christian leaders, we shall press on not only to destroy completely the bad seeds, but also to expand the territories of Christ, and, supported by these achievements, we shall go forward, with God favouring his own purposes, to the most holy expedition against the infidels, the desire for which is deeply fixed in our heart.
Pope Leo XAs far as Martin [Luther] himself is concerned, O good God, what have we overlooked or not done? What fatherly charity have we omitted that we might call him back from such errors?
Pope Leo X