"The truth is not that allegory is Catholic, but that Catholicism is allegorical. Allegory consists in giving an imagined body to the immaterial ; but if, in each case, Catholicism claims already to have given it a material body, then the allegorist’s symbol will naturally resemble that material body. The whip of Penaunce is an excellent example. No Christian ever doubted that repentance involved 'penaunce’ and 'whips’ on the spiritual plane: it is when you come to material whips — to Tartuffe’s discipline in his closet — that the controversy begins. It is the same with the ‘House’ of Holinesse. No Christian doubts that those who have offered themselves to God are cut off as if by a wall from the World, are placed under a 'regula vitae' and ‘laid in easy bed’ by ‘meek Obedience’ ; but when the wall becomes one of real bricks and mortar, and the Rule one in real ink, superintended by disciplinary officials and reinforced (at times) by the power of the State, then we have reached that sort of actuality which Catholics aim at and Protestants deliberately avoid. Indeed, this difference is the root out of which all other differences between the two religions grow. The one suspects that all spiritual gifts are falsely claimed if they cannot be embodied in bricks and mortar, or official positions, or institutions: the other, that nothing retains its spirituality if incarnation is pushed to that degree and in that way. The difference about Papal infallibility is simply a form of this. The proper corruptions of each Church tell the same tale. When Catholicism goes bad it becomes the world-old, world-wide religio of amulets and holy places and priestcraft; Protestantism, in its corresponding decay, becomes a vague mist of ethical platitudes. Catholicism is accused of being much too like all the other religions; Protestantism of being insufficiently like a religion at all. Hence Plato, with his transcendent Forms, is the doctor of Protestants; Aristotle, with his immanent Forms, the doctor of Catholics. Now allegory exists, so to speak, in that region of the mind where the bifurcation has not yet occurred; for it occurs only when we reach the material world. In the world of matter. Catholics and Protestants disagree as to the kind and degree of incarnation or embodiment which we can safely try to give to the spiritual; but in the world of imagination, where allegory exists, unlimited embodiment is equally approved by both. Imagined buildings and institutions which have a strong resemblance to the actual buildings and institutions of the Church of Rome, will therefore appear, and ought to appear, in any Protestant allegory." - CS Lewis, in The Allegory of Love.
