Luther and Lewis

Yet each Christian should be so armed that he himself is sure of his belief and of the doctrine and is so equipped with sayings from the Word of God that he can stand against the devil and defend himself, when men seek to lead him astray, and so help to fight the battle for the maintaining of true doctrine.—Martin Luther, Sermons from 1531

It is only the Christians who have any idea of how human souls can be taken into the life of God and yet remain themselves—in fact, be very much more themselves than they were before.—C. S. Lewis, Business of Heaven, p. 276.